[We are all Christians first. We are the people that God has chosen to draw to him.]
Because we are all Christians first, why wouldn’t we vote for a candidate whose beliefs mirror our own? Think about the “Leader’s Prayer” - Psalm 20
https://www.biblegateway.com/passage/?search=psalm+20&version=NIV
How can God answer when the leader calls if he is not a in accord with God? How can a leader say, “Some trust in chariots and some in horses, but we trust in the name of the Lord our God” if he doesn’t believe it?
Being a nation under God takes a Godly leader who will declare we are one nation under God. The book of Judges show nations are judged by their leaders. We have an obligation to elect Godly leaders to office.
>>The book of Judges show nations are judged by their leaders.
The books of Judges and Kings (1 and 2) prove that depending on a leader to gain favor with God is pointless. The people should cry out to God to lead them in faith regardless of who sits on the throne.
God may allow a “Godly” ruler to go astray (and they usually do) or he may create a David from a man who appears to be a secular disaster. God’s ways are not man’s ways.