No political party is motivated by Christianity.
That said, the Democratic party co-operates with evil and stands with evil on multiple positions that are indeed intrinsically evil.
Nothing about the Republican party is intrinsically evil. Certainly there are Republicans who partake in evil, many perhaps. And perhaps conservatism, especially fiscal conservatism isn’t the most effective way of spreading wealth and feeding mouths, BUT, it is not intrinsically evil.
So long as your intention and conscience is focused on caring for the poor and needy, you can take up either economic philosophy without jeopardizing the state of your soul. I don’t take a position, I let others fight about it. But I see no incompatibility with charity and fiscal conservatism nor fiscal liberalism. I SYMPATHIZE more with conservatism overall because I think it allows people the freedom necessary to offer TRUE charity.