Actions speak louder than words.
It’s what a person does that shows what they really belive, not what they say.
So yes, it is reasonable to judge by someone’s practices.
“So yes, it is reasonable to judge by someone’s practices”
You don’t get to judge who is a Christian. No one does.
Fact is, I have a born-again friend that I guarantee you that you cannot pass his test for being Christian. Guaranteed. So, I guess because he is an extremely faithful, knowledgeable, and judgmental Christian he can hold you as a unrepentant sinner incapable of being a Christian.