You can’t ban religion without banning thinking; and I would never want do that. Banning thinking is what religion is all about. The solution is not to join them (in stifling free thought), but for free thinkers to continue to embrace science and reason and hope more and more people follow our example. If we had stubbornly clung as a species to an appellation to a mythical, invisible, indescribable entity, we would not have learned to cure disease; we would still be praying and dying in our 30's.
If you look at the history of thought after we began to emerge from the dark ages of medieval superstition, the long term trajectory has been AWAY from religion and towards rationality. It may not look that way right now, especially in the Calvinist enclaves of America, but reason has been been slowly but steadily gaining ground over the past 400 years.
With each step forward that science takes, ignorance and magical thinking take one more step back. Religion will probably never completely disappear; but I think that it will eventually become a fringe phenomenon.
Constitutionally it is a violation. But if it were banned w/o also removing the concept of religion from the minds of everyone it would still fail to accomplish anything ultimately. Remember how well the Prohibition era worked in the first part of the 20th century.
The power it would take to ban religion would be a scary amount. So no, I don't want to "ban" religion. A lot of times I wish it would disappear though.