Religion
A "religion" is a highly acceptable thing. Once it is firmly established in a fixed form, people can do anything they want. They can go to church and take communion, while all the while carrying on with their stealing and cheating.
God could say, "Did I ever tell you to build churches, or to celebrate divine worship and communion so as to be saved?" If we think we have something mechanical that will save us, we are heathen. If our Christianity is a matter of forms and rituals, it will be dark around us.
What was the worst thing at the time of Jesus? I will tell you plainly: religion! People stagnated in religiosity instead of expecting something from above.
-- Christoph Friedrich Blumhardt
+ pax