Because over half of conservatives aren’t supporting Cruz. If you don’t believe it take a look at the Caucus Poll here at FR.
That, and Ted gets the endorsements of conservative politicians and former politicians who indeed aren’t known (with the exception of Steve King).
He gets the endorsements of social conservatives and evangelicals and it would seem even a lot of “conservative” Americans are basically saying, “Well yeah, God is good and all but we really don’t care about getting the country back to following Him. There are other things more important.”
Which, I, and others like me no doubt maintain that those other things, while indeed important, are problems that go hand in hand with turning away from doing things God’s way.