I voted Christianity in this poll months ago, but have since come around to Taoism (in the game, not in real life). That is, I'll go after Taoism if I'm trying to found my own religion. Reason is that philosophy is the only religious tech it's important to get to first for reasons other than founding the religion. If you get to philosophy after somebody else, you're in trouble in the race for liberalism.
Some of the other religion-founding techs are useful - like code of laws - but you really don't need to be there first. You can always just trade for them later.