The words “establishment” and “endorsement” have very different meanings.
If I “establish” a restaurant that is totally different than if I “endorse” a restaurant.
If I “establish” a restaurant, I create it, I own it, and I operate it.
If I “endorse” a restaurant, I am just a customer who likes it enough to tell someone else about it.
The first Amendment prevents Congress from making any law respecting an “establishment” of religion. Our Government is not allowed to create, own, or operate a religion (as was previously done by the Government in England with the Church of England).
The first Amendment does NOT prevent Congress from making any law respecting an “endorsement” of religion. Our Congress has always “endorsed” Christianity, from the moment of the opening prayer at the very first session of Congress.
When the President gives the State of the Union address, do you know what is above his head, LITERALLY CARVED IN STONE?
And do you know whose image is carved in stone on the opposite wall?