The Church is made up of sinners, no doubt.
The Church has committed plenty of atrocities, no doubt.
But let me ask you. If the Church teaches that 1+1=3, how can that
be correct?
The Church has the teaching authority given by God himself. He said
to the Apostles, "Amen, I say to you, whatever you bind on earth
shall be bound in heaven, and whatever you loose on earth shall be
loosed in heaven."