Because he was before a crowd where evangelicals are strong and he’s promoting himself while drawing a distinction with an opponent
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What’s the distinction?
In the grand scheme of things, the distinction is small. But it was to impress evangelicals that his evangelical past is much strongeror more familiar.
I don’t see much advantage, but it’s not a dealbreaker. Some voters will think that Donald is the more traditional evangelical for whatever it’s worth.
It would be similar to drawing a distinction with Hillary over who is the real New Yorker.
But again, in the grand scheme, it’s not newsworthy. I don’t think it’s going to change Cruz supporters to Trump supporters or vice versa.