I think this article hits on the true reason but was ashamed to actually admit it as foremost. Many so-called conservatives have become secular to the point of hating those that proclaim to be true Christians. That said, many that claim to be Christian are In Name only. CINOs like Trump that can't name a single Bible verse.
Trump is the push for secularism in the GOP, the turning away from God in America.
So conservatives can only be true-Christians? And true-Christians are only ones that can recite Bible verse?