The people believed they were safe as long as they were in the church. They believed that somehow or another their attendance at services gave them absolution from having to pay for things they had done, and maybe for the things that they were planning to do in the future. This is dangerous thinking that amounts to nothing more than superstition. In the midst of their gross wickedness they were so naïve as to believe that they would be delivered from impending destruction and disaster merely by going through the motions of attending church.
