He made geographical miscalculations.
Coumbus though that the world was small, and Asia was enormous.
His calculation was that Asia was 3,000 miles from Portugal
It was invaded by the Ummayad Caliphate and kingdoms popped up to fight against the Muslim empire
<span>In war, whichever side may call itself the victor, there are no winners, but all are losers.</span>
Specific people who valued religion quite significantly played a role in this. I have studied this material so long ago that I cannot name those particular figures. Do some research and I'm sure you'll be able to find out for yourself.