Some people (too many) are like that. I guess it makes them feel comfortable to know their friends think just like they do...or something. Myself, I rather like discussions about such things, although I might show a little bias to my own convictions and try to convince them if they seem receptive...as long as it doesn't escalate into an argument. And religious people...they're like that...they genuinely want to save you from sin and hell...they really are concerned. What to do? I try to be kind because I know they care, but some people take great offense at any religious outreach. If I do know any hard line atheist (and I'm sure I probably do) I don't know who they are. I'm sure they can be as persistent as some of the religious folks.