The national motto has long been void of any religious meaning or significance, so to say that it amounts to a state endorsement of religion is quite laughable IMO.
Its the same reason that I'm perfectly okay with prayer at public events (such as high school football games) because, in contexts like that, there's nothing even remotely religious about what's going on.
I'm not comfortable about such prayers, but because I consider them irreverent nonsense rather than because they are unconstitutional.