I wanted to look at some points made on Paltalk roughly a half hour before this article was written. proorizo_1 (Point 1 and 3), WhatDoMuslimsKnow (Point 2). I confess I need to hear more of what proorizo said (Working on your comic doesn't help listening to a point on Paltalk, there is a time and a place for working on a comic but I have to be sensible when and having Paltalk open to hear someone's point while working on the comic is counter productive.)
Do Christians deny obedience?
Short answer biblically speaking is no. If one is truly in Christ, he will be obedient. Putting aside the debate of OSAS or Once Saved Always Saved, repentance and obedience are part and parcel of the Christian gospel and message. Jesus said "If you love me, you'll keep my commandments" (John 14:15).
Hebrews are not Israelites and are two different tribes
There was an odd point about Israelites and Hebrews not being the same. There is no basis for this. The word Hebrew refers to either the language or a person, namely a person who identifies as an Israelite. They are not a referrence to two different tribes. Also, The term Jew refers to the tribe of Judah and yes, you have later down the line a Galilee, Samaria and Judea, but that doesn't change an Israelite being a Hebrew in the Old Testament.
Was the word Christian changed over time
Was the name changed to merely professing belief in Jesus rather than obedience? Not really. The word Christian has never changed, it means follower of Christ. Someone who claims to be a follower of Jesus and lives contrary to his instructions deliberately, then he is not a Christian.
P.S. Anything I have said that's incorrect regarding the representation of your points, feel free to let me know.