After it has taken part in such things as tyranny, genocide, slavery, inquisition, cutting little boys' balls off so they can sing better, etc, etc, etc, how can people still believe in Christianity?
Pick up the New Testament, read the parts printed in read and tell us where Our Lord commanded these hideous things you cite.
Won't hold my breath.
"Dear friends, let us love one another, for love comes from God. Everyone who loves has been born of God and knows God."
The "Love your enemies" part should clue everyone in that anyone who practices any of these vile things is not exactly following the teachings of Jesus.
From the goyim kjv bible
Luke 14.26 If any man come to me, and hate not his father, and mother, and wife, and children, and brothers, and sisters, yes, and his own life also, he cannot be my disciple.
Luke 12:51
Suppose you that I am come to give peace on earth? I tell you, No; but rather division