So... this pastor blames people learning about evolution and thinks atheists can't possibly be moral, but you found nothing "really objectionable" about the sermon?
Okay, I realize you found some things at least somewhat objectionable, else you wouldn't have posted as you did. So this is a positive step toward recognizing that this pastor is one heck of a hypocrite, dealing out Christianity with one hand and bigotry and ignorance with the other.
Obviously you know your mother better than anyone else here... but sometimes there just isn't a "good" way to explain this sort of thing. If it's just a matter of you not wanting to go back to this church but wouldn't mind a different one that's more tolerant, I don't know why she would object to that. If you've decided you don't want to go back to any church at all, I can see where that could cause some kind of family rift.
For me, it was easiest with my grandfather; after all, he was atheist as well. My grandmother... well, she didn't talk much about religion, but she did enjoy the occasional special service and music. As for my parents, my dad and I had to agree to disagree. He wasn't religious, exactly, but he wasn't sure what he really was. And my mother... wow. Coming out to her was not good. I really got the impression that she'd rather I had said I was anything at all, other than atheist. She threw her hands up in the air and walked away in disgust.
So you never know how these conversations will go. I hope you and your mother can have a peaceful discussion about this, without arguing or hurt. Hopefully she won't mind if you choose a way that isn't necessarily hers, whether it be a different church or no church.
I will say this, however: This is one of the times in a person's life when you may find out who your real friends are. A real friend would understand and accept, even if that understanding comes later rather than right away.
The objectionable statements this week were not part of the pastor's sermon, but were said by a different man who was leading the Sunday School class. The sermon itself was relatively bland this time.
I would not mind this church nearly as much if I only had a problem with idiosyncratic opinions of one pastor, but it seems his worldview is just a reflection of systemic issues within this congregation (and the Southern Baptist Convention as a whole). There are several individuals there who are clearly worse than him. His views may seem extreme to us, but are quite moderate within the subculture. I have often gotten the impression that he wants to stake out a middle of the road compromise position so as not to offend too many members, much like a politician trying to maintain support among all the factions within his political party. (There are certainly parallels with how Republican primary campaigns operate these days.) Since most of the most reasonable members left years ago, he gets a better response by pandering more to the more fundamentalist elements. The worst things he says tend get the most applause.
(One rather inconsequential example of his moderating behavior that comes to mind is a few years back when my own father was sending out emails trying to convince church members that they really need to witness publicly by buying the "In God We Trust" stickers that the state of Georgia sells for $2 and allows to be placed on license plates over where the county is listed. The official, government sanctioned nature of these apparently made them much better than ordinary bumper stickers, as it demonstrated corporate worship at a societal level. This seemed rather silly to me, and like a violation of the separation of church and state which Baptists held dear long before it was enshrined in the First Amendment to the US Constitution. The pastor responded that he was not going to speak one way or the other on the subject, as the reasons that could lead one christian to oppose such things deserve as much respect and those that would lead another to support them. A year later though, once the stickers had clearly become very popular, he endorsed them wholeheartedly and said my father had been right all along.)
I don't think my family would be any problem with switching to a different church that holds similar doctrines, but I don't know how much good that would do.
I don't intending to stop attending church forever, but would like to take some time away rather than rushing into a new one. I don't want to put down roots until I have a stable job and am living on my own, where I can make my own decisions without worrying about my family's opinions.
My mother has been home sick a lot during the past year and missed many of his worst sermons, but was the only person in the audience other than myself who refused to clap and some things the pastor said. She has complained about the pastor's style, attitude, and tendency to stereotype certain demographics (especially children), but I don't suspect she could go so far as to disavow all the doctrines (original sin, eternal damnation, penal substitutionary atonement, etc) which I think leads to such thinking. She is also too close friends with the other ladies in her Sunday school class to want to leave.
I worry less about explaining things to my mother as to my father, or even sister. I rather hope that she could save me the task of needing to explain to them personally.
The concern with my mother is less about acceptance than about how to broach the subject. She honestly isn't a great listener. Often she responds to what she expected to hear rather than to what was actually said. These days she spends most of her time on Facebook, and if I try to talk about something serious she'll interrupt to show me some (not particularly) funny meme that a friend of hers posted. When away from the computer, she might instead get distracted by thinking of some pun or anagram based on any random phrase either of us said. She is not the sort to ever get angry or hostile, but may say that she wants me to drop a subject if she feels that she is being blamed for some fault. If I share a complaint about by father, she will often try to show empathy by complaining about some similar situation where he hasn't treated her as well as he should have either, making the conversation more about her than me.
My mother was raised in a fundamentalist Southern Baptist home (her father was a deacon and ran ministry focused on evangelizing in prisons, and her siblings remain more conservative than most members of our church), whereas my father was raised by moderate nominal Methodists and did not take religion seriously until he became a born again christian at around age 40. My mother knows the bible better than he does, but is less dogmatic. She was more conservative than him when they got married, but she has moderated somewhat while he has become more extreme. She still has a problem with atheists and secular humanists, but is more open than him when it comes to disagreements among people of faith.
My father treats "Liberal" like the worst of slurs in either a political or theological context and is proud of being Conservative in both theological and political senses. He would not likely consider a Liberal church to be a church at all.
(I am not at all Conservative. I'm Liberal in a Classical rather than Modern Left Liberal sense, but am further left than most of those who call themselves Classical Liberals today. I'm an Agnostic Theist who favors a Neo-Anabaptist form of Progressive Christianity, and a Philosophical Anarchist who considers a Georgist state morally acceptable far more practical than actual anarchist schemes.)
My mother has suggested for a while that my sister and I should try to find another church with more people around our own ages (particularly those we might wish to date). We did try a few over the past few years, but none recently. My dad was involved in naming suggestions, which of course meant they were theologically too familiar. Most I found to be worse than where we are, and the others were not enough better to warrant driving that far on a regular basis. Going there with my sister of course meant that most people assumed we were married, which wouldn't have been good if there had been any girls there worth pursuing (which there weren't). My sister came to prefer another Southern Baptist Church in the next town, which I found worse than ours but which had a very active singles program (for unattractive people in their 30s to 50s) which she liked and was involved in for a while. Our church has grown in that demographic since then, and my sister has become increasingly involved here.
My parents seemed to assume that my sister and I would want to go to the same church, but what we really want is very different. She is more inclined in a conservative charismatic direction, whereas I demand more intellectual rigor. I am much more comfortable being myself when she is not around.
There was one time when both parents were ill when my sister went on to that other baptist church without me, and I tried a Disciples of Christ congregation instead. I quite liked the sermon and the pastor there, but the music was terrible, the program was far too rigid, and the few members they had were all old enough to be my parents or grand parents.
Unfortunately I don't have a lot for real friends to turn to right now. The one friend I always knew would understand and accept me cut off contact last October, at a time when I was so depressed that she said our last couple conversions left her too drained to properly care for her daughter.