The establishment clause was designed to prevent the government from imposing a religious obligation on citizens. Some of the colonies required their citizens to attend (and I would assume tithe to) the Church of England. The Constitution and its amendments were not anti-church, they are against compulsory participation in a church.
This wall concept has been overblown to imply any relationship between the government and a church, but that was not the intent - our founding fathers saw value in religion and religious institutions, just not in the state controlling the them. During the hurricane season last year, it took special legislation (as I remember) for the federal government to provide disaster assistance to churches because of this supposed wall. The result was that several churches were unable to serve as refugee shelters because they were churches, which benefited nobody.
Some of the questioning in Senate confirmation hearings lately have seemed to impose an anti-religious test that appeared to question anyone who held religious, especially Catholic, beliefs.