About Judas not being a Christian? It's widely believed he stole money, He is called Son of Destruction, not a Son of God, he died with Jesus still alive, but didn't come back to Jesus like Peter did. Jesus said he wasn't clean. The word of the Lord cleans us. Judas said he betrayed innocent blood, but he didn't say I betrayed my Lord. Jesus said He lost none of those given to Him.
Due to these factors, I can say Judas followed Jesus, but I can't say he made him Lord. And finally even if he did, Holy Spirit wasn't given yet. Jesus said He had to go first. And believers now are SEALED by Him as our guarantee.
i hope this helps explain my thoughts. Feel free to ask anything else.