So if a Jew converts to his own Christian Church of Himself, to whom will he appeal when a Muslim or Christian from another Church seeks to kill him for being a Jew? Is he a lamb to slaughter?
He appeals to the Messiah.
THAT is what makes someone part of the body of Christ.
Anyone who wants to kill him for not belonging to their particular denomination is not a follower of Jesus.
If he dies for his faith in the Messiah, and refuses to renounce him, he is a martyr and will receive a martyr’s reward.
The big problem is the worldly mindset that has infected religious thinking that a church congregation or denomination is a relationship with God through Jesus.
It’s on an individual lever, not a result of church or denomination attendance, membership, or affiliation.