The 1st Amendment to the Constitution ensured religious freedom for everyone. It wasn't until a former KKK member appointed to the Supreme Court by FDR found a concept of "separation of church and state" that didn't appear in the Constitution that the democrat party's war on Christian beliefs started.
Actually that term "separation of Church and state" was founded by.... Thomas Jefferson. When he wrote a letter to a church about what he meant with the 1st amendment saying "I contemplate with sovereign reverence that act of the whole American people which declared that their legislature should make no law respecting an establishment of religion, or prohibiting the free exercise thereof,
thus building a wall of separation between Church & State. "
So while it is interesting to try and erase that history and rewrite it as new hundreds of years later, that is a lie. When the Supreme Court went to interpret what the Founding fathers meant with that clause, they went to what the founding fathers said was their meaning with that clause. A "WALL of separation between Church and State" was their intent.
And this is supported with Madison's writings (Madison led the proposal and was on the committee for this clause in the 1st), where he writes about the debates among the committee and how some initially pushed for allowing the federal government to endorse religion in a general way as long as it did not engage in preferential treatment of any sect. And how overall the committee decided that was too weak and that a clear separation needed to be established.
As for the "democratic war"... the supreme court decisions to follow that separation were supported by Eisenhower nominees in
Abington Township v. Schempp which removed the Lords prayer and bible reading from schools, Lemon v Kurtzman which said that new laws could not push religion, and Nixon/Eisenhower appointees supporting and leading the majority opinion in Wallace v Jaffree that confirmed further laws that support religion can't be passed.
And the Lee v Weisman case which the court opposed school prayer had the majority with O'Conner/Kennedy (Reagan appointees), Stevens (Ford Appointee), Souter (HW Bush appointee), and Blackmun (Nixon appointee). The only Dem appointee to the SC actually dissented with that majority opinion.
So Eisenhower, Nixon, Ford, Reagan, HW Bush are now democrats? This just took an odd turn into some alternative history here.