I agree, you need to trust at some point that people are who they say they are, that they're being sincere, etc. But the internet being what it is, and so very impersonal, it does leave an open door for people to make new personas for themselves.

I didn't say I would disapprove of a creationist trying to pose as an evolutionist. I just doubt if they'd be very successful. If you've got some time on your hands at some point, you're welcome to prove me wrong.