They want to prove that an American Evangelical Christian "true conservative" can be elected President by calling up millions and millions of non-voters, and they think they are entitled to their shot because of their own faithful voting behavior in the past.
They believe that, because they can defeat any Republican by witholding their votes (arguably true), that that must mean that if they get their way that victory is certain (definitely false).
I've had this argument dozens of times, and it always winds up that I hate Jesus or am pro-homosexual. It's not a really productive conversation.
I know what you mean and agree.