“Peters defense to the actual leadership that had Jesus crucified.”
Acts 4:10, All of Israel was being addressed:
“Then know this, you and all the people of Israel: It is by the name of Jesus Christ of Nazareth, whom you crucified but whom God raised from the dead, that this man stands before you healed.”
“Where is it written the gentile believers should gentilize the Jewish believers?”
The way to Salvation for Jews and Gentiles is through Jesus Christ. Jesus Christ wants us all “Jews, Gentiles” to come together through him:
Gal 6:16 - And as many as walk according to this rule, peace be on them, and mercy, and upon the Israel of God.
New living translation:
Gal 6:16 -
May God’s peace and mercy be upon all who live by this principle; they are the new people of God.
The “Israel of God” are now those with Christ in them.
Ah Acts 4:10 Peter does not say all Israel crucified the Christ only the man healed is healed by Christ whom the leadership crucified.
Where does a Jewish believer have to stop being Jewish to be saved?
Galatians is addressed to gentile believers. Gentiles don’t have to become Jews to be saved but by the same name Jewish believers are saved.