Im athiest but I have no issue with conversation as long as its polite. I would regularly discuss christianity with a nice old lady who was a jehovas witness. she handed out slips but was not pushy or rude. I would discuss and even said I would for the sake of conversation assume the bible is real. She took my views in stride that you would think would upset someone from such a fundamentalist faith. If people did not want to talk to her though she did not bother them or such.