I think you meant rarely help . . . not really help . . . to sway . . .
I don't think you can hold back the tide on gay marriage regardless of who you vote for. Delay it perhaps. It's basic civil rights. At one time interracial marriage was viewed the same way, as well as interfaith. No church can be required to sanction a gay marriage though. That's also a part of our constitution, as are the basic principals of civil rights. And no one is going to force you to marry a man.
On abortion I wonder what gives you the right to choose for the woman? It's her body, and her life. If we have all these babies, which party is more likely to help look after them? And if it's the sanctity of life that concerns you, why is the death penalty such a good thing?
Again, on the governmental level these are civil issues - women's rights and the right to life liberty and the pursuit of happiness. There's reasonable debate about when life begins, but there's little or no debate about the fact that the death penalty ends life.
You can slow down the march of freedom and other basic human rights, even turn back the clock, but you'll never in the end stem the tide.
At the same time you are more than welcome to your views and beliefs in our great country. That will never change because of the outcome of this election. That's why I think the choice is clear between a Republican party that wants to reinstate the policies that drove us near to economic depression, and a Democratic party that wants to continue the recovery.