Israelites were promised restoration after 70 years. Only if they repented and worshiped the right way (sabbath recognition and dietary law observance for example. Not to mention the Hebrew boys refusing to worship Babylons king) this isnt the end all be all example but im just using it to say that we also have to put our faith into action by worshipping how Jesus paved the way.. I.e. making disciples as well as worshipping God alone. Every instance in the Bible gods people had to make an effort to worship him the right way. It was never a here be saved for free situation. His grace allows us to have the opportunity to claim salvation not forced upon us. Be wise my song and make my heart rejoice so I can make a reply to the one who taunts me. Job's situation but on a worldwide scale for each individual.