Muslims are allowed to practice their faith are they not?
The founding fathers were careful to not promote one faith over another. Many had fled their homelands for that very reason.
This is a nation founded on the principle of being allowed to practice the faith of your choice, which is why the documents say things like Creator, or God instead of Jesus.
No. They did not favor any flavor of Christianity over another.
Islam is a form of government that is not conducive to freedom. It includes sharia law. The founders would NOT back an opposing form of government that is tyrannical. And they opposed a theocracy which is what islam is.
This is not a muslim nation.