I just had a brilliant idea. The next time I meet one of those 'bible preachers' I'm going to play along. Join in, and make a big scene. Because while they are quick to try and convert and defend their religion, they won't be nearly so quick to just preach it (and loudly) to those who appear to already be converted. I can totally see getting them to yell and should how they love jesus, and then turning on them and saying 'oh wait, I'm a pagan'.