One thing I like about Islam is that although Muslims are instructed to inform people about their religion, if a person clearly doesn't want to hear it or is not convinced, there is no requirement to badger them until they are "saved"

lol: oh you evangelical Christians).
For example, as I mentioned in other posts, my mother is an Orthodox Christian. She doesn't like the idea of me being an observant Muslim (because she's got one of those irrational, stereotypical "the world is out to get Muslims" fears) but she's fine with it. Whenever I try to have conversations about it with her, or try to advance certain arguments, she typically doesn't want to talk about it. She's not at all religious but she believes in God.
My father is a Muslim (Shi'a, though I'd say I'm a Sunni). He's not religious at all either, and if anything would rather I be not at all religious, like my mother wants

.
The point is, I don't feel a need to bother my mom about it repeatedly, or my dad about being more observant.
We're basically required to bring people the message, and to engage in rational discussion/debate. What people decide to do with that information is up to them.