As American Citizens they are have the God Given Right to pursue their agendas and interests in all areas of American society and government.
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As American Citizens, they have the Constitutionally given right to pursue their agendas and interests in all areas of American society and government.
They DO NOT have ANY right to force their religion on anyone else. Including making people say " Merry Christmas ".
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As Self Identified Christians are 70% of the population is a democratic Republic one would expect the Culture and the Government and the Laws to reflect Christian values and culture.
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If one expected that --- one would be WRONG --- America is NOT and HAS NEVER BEEN a religious state. Some of the colonies were founded by religious groups, but when they formed the nation of America they abandoned that and wrote the Constitution which FORBIDS any religious test for holding office which shows they didn't want people voting their religion to run the country.
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Your denial of INherent Human Rights is normal for leftists.
BUT for now, anyways, until you leftists take it away, these Christians have mostly the same rights as other Americans, and are the vast majority of the nation.
The rest of your post seems to be mostly leftist spin.
I said nothing about forcing anyone to say "Merry Christmas". Or forcing Christianity on anyone.
But, the cultural and moral beliefs of Christian voters are just as valid as your.
Legally speaking.