Some will, but some tend to stick around. That was always my experience when I went to church, and that was at a Catholic church. Remember, church just isn't a religious thing it's a community. It does take time for people to come out, so you can catch them as the exit. I think people won't mind if you're out on the public sidewalk asking questions instead of intruding on their holy space.
"The way to see by faith is to shut the eye of reason." Benjamin Franklin
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