“A real believer would …”
No where in Christianity does it instruct Christians to make any such judgement. It nowhere instructs us how to do so
It is impossible for anyone to judge another’s relationship with anyone else. And not with God
Back to the anal retentive tendency...
We are to judge with a righteous judgment, but I didn't judge you.
I observed that you don't act like you understand salvation and that firming that up is a good thing to have salvation.
Simple as that.
A real believer would not be offended by that.
Only you can reconcile that with God. If you are, it is an indication you may not be saved.