I know what you're trying to do here, and I want you to consider the logical extension of what you're saying. Consider if you got what you want, and all the American Evangelicals publicly agree to vote ONLY for candidates with the absolutely highest moral character, candidates that belong to and are members in good standing in an Evangelical church, IOW, one of their own.
How long would it be before democrats started running around screaming about a theocracy and demanding that Evangelicals stop insisting on such high moral character?