What do christians have against gay people

[DeistPaladin]

There are a lot of reasons. For one thing, I notice that modern christianity hates on gay people more than adulterers even though Jesus supposedly reiterated that 'God hates divorce' yet did not mention homosexuality at all. Why is that?

Because many of the Christian leaders and "family values" politicians who rail against gay rights are themselves either divorced and/or have a history of adultery.

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I think somewhere Jesus gives the impression that he's against the Old Testament laws.

But, I know that Jesus says somewhere else that he hasn't come to change the Old Testament laws he's came to carry them out.

Bart Ehrman in "Lost Christianities" wrote that different Gospels promoted different religious agendas. The Marcionites, who rejected all things Jewish, used a Gospel which is a variant of the Luke we know today. The Ebionites, who were the most Jewish of the early Christians, had a variant of Matthew.

Matthew is the most Jewish of the Gospels. It references the OT (incorrectly quite often) and tries to fabricate fulfillment of prophecy regarding the Messiah. It also insists on adherence to OT laws. Other Gospels speak more to Jesus "fulfilling" OT laws and thereby making them obsolete. Were it not for Paul bringing the taboo against same-gender affections into the NT, the admonishments against homosexuality might be counted among the "fulfilled" laws.