Which Gospel?
"For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth..."(Romans 1:16). What is the gospel of Christ?
"That if thou shalt confess with thy mouth the Lord Jesus and shalt believe in thine heart that God hath raised Him from the dead, thou shalt be saved".(Romans 10:9) "For whosoever shall call upon the name of the Lord shall be saved." (Romans 10:13).
Is this part of the Gospel of the Kingdom?
Whatever that means -- it's a new one on me. I tend to lose track of all the trendy little epithets folks come up with to dehumanize those with whom they disagree.
I certainly try to avoid arguing on the basis of those epithets.