Their values are diametrically opposed to Christian values. The more I see the veil removed from the leftists, the more I believe they are just purely evil.

Leftism doesn't believe in personal responsibility. Leftism doesn't believe that Man is inherently sinful, therefore Man doesn't need a God to redeem them.

Christians believe we are born with a sinful nature and must work to become good by following the tenets laid out by God and the Bible. We cannot lift ourselves out of sin, only Jesus can do that. Leftists reject all of those beliefs and therefore hate Christianity.

There are plenty more reasons but those are some of the major ones I can think of.