Apparently I'm the only one who thinks this is probably not that big of a deal.
Guy sees pretty girl, guy wants to know pretty girl. It's not that strange, nor creepy unless that guy is indeed creepy.
Women get messages and friend requests online all the time from guys who aren't scammers or creeps. It's very common, and the prettier the girl the more it will happen. Many times it's actually successful for the guy.
I don't take that approach to asking out women myself but it definately works at times for some guys. I wouldn't say I'd never do it either, if all of a sudden I was on one of my Christian friends profiles, and I saw a girl who was one of their friends who was really pretty and clicked her profile then found out she was completely devoted to Jesus and seemed similar to me in faith and values and lived in my area, why wimp out and miss that oppurtunity if I really had the desire to get to know then? Life's short here, take some chances, the worst that could happen is you get shut down.
With all that said, I think Christian women have to be careful, not because of scammers but just because a lot of guys are unsavoury who do that sort of thing frequently. Firstly, if he's not a Christian, a Christian is simply not permitted to date them - scripture is clear. Secondly, even if he claims to be Christian, you still have to be wise with the things he's saying, because men as a whole are frequently focused on one thing (which I need not spell out).
So while he might not have the best intentions, neither do lots of guys who hit on women offline either. Doesn't make them creeps or scammers, just unsavoury worldly people that Christians must be wise about.