@Wolfangle Some people hate religions in general and don't want to talk about it because they either 1) Thinks they're going to hell (If religious) 2) Don't believe in religions at all (and most of the time, they have a religion of origin that traumatizes them).
To put it simply, NO ONE wants to talk about religions and people are going to hate it more when you go door to door about it. ESPECIALLY when you happen to try to chug an atheist.
I think this movie is relevant to your question
Also, as for preaching to believers of another religion or another denomination, you might think you're preaching the truth but for them, IT'S HERESY.