The united part sort of said to me that they weren't very tolerant.
I think the motives of this group and the motives of the writers of the Constitution are completely different. This group's motive is to remove the association between government and religion. They want to diminish the influence of conservative members of every religious group, particularly Christians. They don't want to be reminded that the foundational principles of this national are profoundly rooted in the Judeo-Christian tradition.
The Constitution's writers' motives was to protect the America from the corrupting marriage of nation and church that was common in Europe. Members of certain religious groups were persecuted depending on the religion of the Monarch. Evidence of the intent of the founders to honor and recognize God Almighty is found in government documents, on public buildings, on currency, and in their personal correspondence.
This group United for the Separation of Church and State seem to really be promoting abandonment of Judeo-Christian principles for an amoral paradigm. America will cease to be great when she ceases to be good. In fact she will cease to be "America" with all the connotations associated with the name. They state that will result from this "separation" will be something entirely different from the one the Constitution was written to protect.