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li0scc0 said:
You know someone is a Christian if they are in the world, but not OF the world.

That is not failsafe, because, I am sure, many Christians are 'of' the world and still many others are isolationists, not 'in' the world.

So basically by your own statement:
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That is not failsafe, because, I am sure, many Christians are 'of' the world

You've proven that you can't tell a Christian from a non-Christian. So when you see Christians behaving as non-Christians do you assume that they are saved? Tell me what exactly does regeneration mean to you?

Peter

If you believe what you like in the gospels, and reject what you don't like, it is not the gospel you believe, but yourself. Augustine of Hippo