He never knew them.
He didn't say He once knew them.
So of course they didn't believe. True belief is the obedience of faith, of which Paul speaks, and entails not living a lawless life.
It's sad that you see them as servants of Christ, doing what they were told. They were none of this.
Now, fetch some church fathers who have believed your take, and please quote them.
I know, I know you don't listen "to any man", but only to yourself, so the request is moot - but it is rather convenient that you will not listen to God's men when we have this; Ephesians 4:11ff; 1 Timothy 5:17; Hebrews 13:7; 2 Corinthians 4:5; Hebrews 13:17; 1 Corinthians 16:16; 1 Thessalonians 5:12. (Sure, you can try and take 1 John 2:27 out of context and pit it against these passages but it won't fly).
Yes, interestingly enough, you say all you do is listen to God, but this isn't accurate, as you really do not listen to all of His Word and follow His decreed mandate in the provided passages above.
This is all rather convenient for you, not to listen, so you have no accountability to God's Word really, but only to yourself, and make yourself, not God's Word the final authority.
Again, the persons in Matthew 7:21-23 were not believers, they were never saved, they were never converted, Jesus never knew them. You are implying He did know them (a phrase intending a personal relationship/salvation) contradicting His solemn words.