While many political opportunists cynically pander to an evangelical base by nodding to socially divisive issues they only cursorily believe, I don't doubt the sincerity of Santorum's beliefs or the strength of his convictions.
It's typical to think that theology is static and permanent. It's not, though. What's true instead is that theology follows sociology. And slowly but surely we are all becoming members of one big society.
Jesus doesn't show us a God who is harsh, punishing, aloof, and vindictive. He presents a God possessed of qualities directly contrary to those, a God who loves as God alone can: absolutely, unconditionally, unmitigatedly, freely.