The bible leaves out many macres caused by christians and catholics?

Not once in the bible does it mention the Conquest, in which Cortes went to Tenochtitlan(Aztec city) And tried to convert everyone, but when they denied it he killed over 235,000 people with his army. All they did was follow the religion they were taught, even though there was human sacrfice it does NOT make it bad, they believed the sun needed blood to rise, yet cortes wiped them all out(90% of the aztec population was wiped out, read up on history NOT WIKIPEDIA and it will even tell you) And even more macres happened caused by the christian faith. Anyone know why they leave this out?