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Here are more reasons by Republicans are mostly Christians.
The "Christian Gap" between Democrats and Republicans is growing wider.
A recent analysis of data compiled by the Pew Research Center shows the Republican Party becoming more Christian as the Democratic Party becomes less Christian.
"In sharp contrast … Most Americans who don't identify with any religious faith — a rapidly growing group — now align with Democrats." Many of them are Muslims who want to destroy Christianity, and establish their global desire to make the world for Islam. E.g. Obama's religion of peace.

Most Republicans have happy families, with complete fathers and mothers and raise their children responsibly. Most religious institutions and universities are populated by Christians who are Republicans’ E.g.. Liberty University,
E.g. https://www.niche.com/colleges/university-of-notre-dame/
And so many other Catholic Universities all Christians, and mostly Republican students.

Most Republicans have happy family, married and are Christians. In contrast to the democrats, most of them are Atheist, don’t have families that stay together. Many of them are Muslims bred so many Muslim kids but they want to destroy Christianity.
Most Republicans follow the virtues of being Christians.

The four Cardinal Virtues of being Christian. Most of the Republicans follow these virtues. Prudence, Temperance, Courage and Justice. The Seven Heavenly Virtues: Faith, Hope, Charity, Fortitude, Justice, Temperance, Prudence

Republicans follow personal responsibility. That is why president Trump offered all Americans jobs to take care of their own and their families.

God said, those who don’t work, don’t eat.
Jesus told several parables in which responsibility and accountability are at the center. Illustrative is the parable of the talents. Before a man went on a journey, he entrusted money to his servants. When he returned, each servant had to give an answer for what he had done with the money assigned to him. To those who doubled their money, the master exclaimed, "Well done!" However, the one who hid the money in the ground was severely judged for his irresponsibility ( Matt 25:14-30 ; see also Luke 19:11-27 ).
https://www.biblegateway.com/verse/en/2
%20Thessalonians%203%3A10
Republicans don’t support A******ns.
Click here to read the contract "What Does the Bible Say About A******n?"
and fetal tissue
Genesis 1:28 King James Version (KJV)28 And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have d******n over the fish of the sea, and over the fowl of the air, and over every living thing that moved upon the earth.

Republicans are charitable. Because of their Christian faith Republicans have served and provided to the sufferings of the world. In every calamities and diseases Christian Evangelicals and Catholics help and provide medical care. E.g. Ebola in Africa. Brought medical care, manpower to help the victims.
Catholics do fund raising annually to help the sufferings of the world. We raised millions of dollars every year to share what we have to the less fortunate children of God.
We are Republicans.

While democrats are liars, dishonest, corrupt, like Hillary Clinton and Bill, and Obama's Deep State. Most of them don't believe in Christ.