Past and present, I come from a "religiously diverse" family. That's been the case for at least 4 generations.
So, to answer your questions:
1. I don't care what anyone believes, whether they're 'everyday people' like you described, or even family/relatives.
2. I came to my beliefs on my own- was raised with nothing.
3. I can only speak for myself, but re: 'strong feelings'- individuals who want to shove their beliefs down other people's throats, individuals who harm others and 'credit' their 'religions' for it, and individuals who show flat-out disrespect ranging from condescending to ridicule. Otherwise, like I said, I don't care what anyone believes, or if they believe in nothing at all, it's their business not mine.