Even a brief glance at what MADISON HIMSELF said the amendment meant (located in the Annals of Congress) clearly show it was only intended to stop the govt. from prohibiting the freedom of religion and establishing a state religion or giving an unseemly amount of support to one denomination.
It did not even mean that Christianity could not be supported by the govt., for it has been in our history up until the 20th century and supported by courts in that process.
There is a reason the Blaine Amendment failed.