It should be easy for Republicans to select a candidate for president.
Just let God do it for them.
The only problem with that is this: God has already endorsed several, if not all, of the candidates.
Fortunately, the Bible has a foolproof procedure guaranteed to work even when God can't make up his own mind. It's called a lottery.
That's how God selected the first king of Israel. Here's how it worked.
God told the people to present themselves to him by tribe and clan ("thousands").
Samuel called the people together unto the LORD ... And said unto the children of Israel, Thus saith the LORD ... present yourselves before the LORD by your tribes, and by your thousands. 1 Samuel 10:17-19
Then a tribe was selected by lot. (Benjamin had the lucky number.)
And when Samuel had caused all the tribes of Israel to come near, the tribe of Benjamin was taken. 1 Samuel 10:20
Next, a clan was selected. (Matri)
When he had caused the tribe of Benjamin to come near by their families, the family of Matri was taken. 1 Samuel 10:21a
And the king was selected from the clan. (Saul)
And Saul the son of Kish was taken. 1 Samuel 10:21b
But Shucks! When they looked, they couldn't find him.
When they sought him, he could not be found. 1 Samuel 10:21c
So they asked God what to do and God said that Saul was hiding in the stuff.
Therefore they enquired of the LORD further, if the man should yet come thither. And the LORD answered, Behold he hath hid himself among the stuff. 1 Samuel 10:22
And sure enough, they found Saul hiding in the stuff. He was hard to miss since he stood head and shoulders above everyone in Israel. (He was also the best-looking.)
And they ran and fetched him thence: and when he stood among the people, he was higher than any of the people from his shoulders and upward. 1 Samuel 10:23
It all worked out great in the end. God chose the best (tallest, best-looking) candidate and all the people shouted, "God save the king."
And Samuel said to all the people, See ye him whom the LORD hath chosen, that there is none like him among all the people? And all the people shouted, and said, God save the king. 1 Samuel 10:24
Well, except for a few "children of Belial" (RINOs) who complained about it a bit.
But the children of Belial said, How shall this man save us? And they despised him. 1 Samuel 10:27
So there you have it. No need for expensive campaigns, debates, caucuses, straw polls, primaries, or nominating conventions. God's party should select its candidate God's way: by lottery. (Either that or just choose the tallest, best looking candidate. It should work out the same.)
(By the way, this isn't the only time a lottery was used in the Bible to select an important candidate. Matthias was selected by lottery to replace Judas, who died by spilling his guts out and hanging himself.)