I don't think I could say what I said any clearer, but I will try. I'm sure you've heard the saying -- The road to hell is paved with good intentions. My father thinks that about Christian conservatives. While their intentions are good, politics is not the place to discuss those things. He thinks Chistian conservatives are damaging Christianity and losing their moral authority by whoring it out for partisan political purposes. There are millions of voters, Right, Left, and Center that think just like my Southern Baptist, deacon, Sunday School teacher father. Is that clear enough for you?
Perhaps he and they are wrong. The question you should ponder is, what if he and they are right?
I've heard that argument before, particularly from Cal Thomas, who co-wrote the book "Blinded by Might" on that subject. With all due respect, I think he, and you and your father are largely incorrect on this issue. What I see from Jerry Falwell is that he spends most of his time continuing to build a great university. What I see from Pat Robertson is that he puts out a show, the 700 Club, that spends very little time on politics and where it does, it focuses on issue like abortion and traditional marriage.
It's true that James Dobson has probably gotten a swelled head-- this came out when he personally ripped Republican leaders as accesories in the killing of an innocent for spending what Dobson thought was their taking undue time in crafting a loophole-free bill to protect her. As it turned out, he was wrong and they were right, but since then, I'll admit has only gotten more and more arrogant. But I fail to see how the actions or tone of one man indicts the Republican Party or the evangelical movement. The Democrat Party is devoted to advancing secularism-- it is not only anti-Christian, but anti-theistic.
I fail to see how advocating protection for the unborn or traditional marriage goes beyond the bounds of the proper role of government or how social conservatives who advocate such are somehow speaking out of turn. I'm sure your father is a great guy, but I don't see any plausible arguments for his political stance.