From my understanding, Marc happens to observe some of the same things that you do, although he's not a Judaizer. Nor is he contemptuous like you.
The difference is attitude. He does it out of preference and doesn't judge others. He is not prideful and arrogant.
I want you to remember something. If you really do come to the Lord at some point and realize your error, I want you to remember that we tried to help you see the problems with the false doctrines you've been deceived with. I wish someone had spent this kind of time with me when I was younger so I hadn't gotten caught up in Armstrongism.
Ask yourself if their teaching is really on Jesus Christ and him crucified, or if it is on legalism. Do you talk about Jesus, or do you just treat him like some side issue? It really needs to be in the center of your faith and not some minor side issue.
Also, would God approve of you making remarks to an older man like that? I can understand you saying such things to me as I've spoken very bluntly, but Marc has not treated you that way.
@Marc
This is how you read your Bible:
blah blah blah blah blah YOU ARE NOT UNDER LAW BUT UNDER GRACE blah blah blah blah