Mormon 9:9-10; “For do we not read that God is the same yesterday, today, and forever, and in him there is no variableness neither shadow of changing? And now, if ye have imagined up unto yourselves a god who doth vary, and in whom there is shadow of changing, then have ye imagined up unto yourselves a god who is not a God of miracles.”
Malachi 3:6; “For I am the LORD, I change not; therefore ye sons of Jacob are not consumed.”
This is another example of what I use to witness to the Mormon missionaries. If God cannot change how did he become a god after being a man?