Trump supports a temporary ban on Muslim immigration & Cruz does not.
Basically you are misinformed. In fact Cruz was there first. Trump had to back away from his extreme and over-broad first statement and there is very little air between the positions of both men on this issue.
Meanwhile, Cruz is positioned to take the Iowa caucuses even if he were 5% behind in the polling. But he is not. He is leading in Iowa and his real lead on caucus night will surprise many, you for sure, and maybe even me.
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Cruz may win Iowa...but I don’t see him making a run in any other state.
Your crystal ball may be better polished than mine.
Time is the revelator: eventually all will become clear.
Until then, I know who I support, and support him I will, right up to the end, in whatever form the end may take. Victory is the goal, the purpose and the motivator.