My best buddy's brother convinced him of flat earthism. It was mostly based on fundamental Old Testament beliefs that the world has four corners and is surrounded by water above and below. He gave me a book called The Greatest Lie Ever Told: Why the Earth is Not A Spinning Globe, or something like that, and I only got through the introduction and the first chapter because its only reasoning why (((they))) don't want you to know the truth involved hatred against immigrants and minorities, demons and political conspiracies, and gays taking over the world and forcing everyone to practice "Islamic black sex magic". Apparently the gay muslims would kill and enslave all the straight people and outlaw the worship of God and force people to worship the devil. Muslims. Outlawing the worship of the God of Abraham.
We're not friends anymore.