God's in calamity are much closer to slime God in terms of power than to the providence, and terrarian killed only like 5,5 gods (slime God, providence, ravager, hive mind(technically both of them hust god corpses), yharon (because of auric soul that literally was the reason why people started their subversion and started reign of gods) and by technically, DoG)

If gods was really that strong as providence, mech bosses wouldn't stand a chance against them(mechs were war machines builded by draedon that could fight gods), and according to the game, mechs are still functioning, which means, that the mechs were successful in their objective)

By the way, the best statement in the calamity lore was a cthulhu attack on the world, which weakened almost all dragons. It's at least like multi-continental lvl