You miss the point of what Land said. He's not advocating that evangelicals vote third party or not at all. He's telling you that they won't vote for Giuliani if he's the nominee.
In other words, he's telling you that if you build an airplane out of solid cement, gravity won't let it fly and it will crumble under its own weight if you try. The evangelical and social conservative Christian vote is not going to go to Rudy. It can't. It is a force like gravity and you can't change it, you have to understand it and work with it. As a conservative Christian there are no circumstances where I can vote for a person who supports abortion. Giuliani is the worst Republican candidate, in that respect, that has ever been a frontrunner. If he gets the nomination, the Democrat will win.
Have you ever voted for a democrat? If so who?
If Rudy gets the nomination and the only other options are third party or democrat...third party votea will give it to the democrat. Is there a democrat who is pro life? What kind of supreme court judges witll the democrat appoint?
If there could ever be a viable third party...true conservatives...that would be a God send.