Read the first commandment. Then read the first amendment. They are most certainly incompatible. You can not declare there to be only one God and then say you have the freedom of religion. That's like being told you can eat any kind of burger but then are told that your only 'choice' is a cheeseburger.They're not incompatible.
And thus you can not possibly believe that Christianity is not in direct opposition to our 1st amendment.In order to be a Christian you must subscribe to the First Commandment,
And yet this is not what we're discussing. We're discussing the contradictions Christianity poses to the document that our laws are generated in accordance with. The Constitution.but nowhere does it say to force others to do so.