1 Cor 1:23 but we preach Christ crucified
That may be, but he WAS crucified. Take Him off that cross.
What is true power? Is it to be able to push people around, as a bureaucrat can? Is it to be able to control someone's access to the truth, as LBJ's administration did by concealing the cost of the "war on Poverty" AND the war in Viet Nam? That concealment led to us spending money and lives and losing both wars.
Our Lord showed TRUE power by revealing the truthof Sin and of the Suffering Love of God.
Some protestants see a man on a cross and think, "Weakness."They do not understand (neither do I!) Divine power. They think that God the Son of God on a cross is about weakness.
But True Power, God's power, is so unlike ours that to the unredeemed eye it looks like weakness.
and therefore they reject crucifixes. They don't know power when they see it.