Yes, God will punish every black Christian who votes for a politician who supports gay rights, transgender rights, and homosexuality, because the Holy Bible is clear about the fact that God hates gay people.
If black churches want God the Father to love black people, then it is absolutely necessary for black churches to preach hatred of gay and transgender people, which is a requirment by God the Father in the Holy Bible (both the Old Testament and the New Testament).
God exists, and God will punish all black people who vote for a pro-gay politician. God’s punishment can take the form of Sickel Cell Anemia that kills children of black people who vote for a pro-gay politicians.
Life belongs to the LORD Jesus Christ, and God can take life away. That is God’s right, as shown in the Holy Bible, in which God kills many believers who stand against the Will of God (Exodus, Acts, Revelations).