Ummm it’s really not judging when you simply point out scriptures that indicate some people will fool even themselves and only God and the believer know if the truth is sincere and secure in your heart. With others we’re simply told to see what kind of fruit they bear, but even that imho can be mis-leading sometimes.
When you think someone is ‘judging’ try to think if they are actually handing down some punishment for you and if it is binding.
Jesus gives us criteria by which to determine if someone is a follower of His.
We are commanded in other places in Scripture to test the spirits to see if they are from God and to compare doctrine to the apostle’s teachings to see if it’s from God.
Believers are not to simply believe everyone who comes along and claims to be from God.
But that is not judging in the condemning sort of way. That’s Christ’s job and He will do it.
But there’s no other way to point out error and warn people that they are on the wrong path than to point out error. If they don’t want to hear it and shut down debate by accusing the other person of *judging*, then so be it. That’s their choice.
But recognizing and pointing out that something doesn’t line up with Scripture is necessary, otherwise there would be no way for people on the wrong path to find out.
Not telling them that they are in error compared to the Bible is not doing them any favors.