There are a lot of Jews among Republican Establishment, and that is why so many Republicans in office tolerate homosexuality and gay marriage laws. Unfortunately, Jews of the United States of America do not follow the Holy Bible and oppose homosexuality.
Jews of America are Rabbinic Jews. This means that they go to synagogues and do not really believe in the Jerusalem Temple. As such, the primary religious text for the Jews of America is the Talmud and not the Old Testament, unfortunately.
In other words, Jews of America do not represent Israelite religion of the Old Testament. After the destruction of the Jerusalem Temple in 70 AD, a new form of sectarian Judaism, called Rabbinic Judaism, grew in the absence of the temple. And this is the form of Judaism (cultic or sectarian) that is dominating in the USA.
So, it would be inaccurate historically to see Jews in America as a continuation of the Old Testament Israelites in terms of religious commitment.
Also, there are Mormons (cultic group) among the Republicans, such as Mitt Romney. As many Americans know, Mormons support polygamy and have a very secretive religious organization. They are growing in number because all Mormons are required to do two years of missions work for the Mormons.
Mormons certainly do not want a Christian America. In this, Mormons in the Republican Party share the same ideology with the Jews in the Republican Party.
They do not want a Christian America. And they will fight against a Christian America.
Establishment Republicans of today must be scrutinized with critical thinking by all Christians in the United States of America, who profess Jesus Christ as the LORD and Savior.