Perhaps we needed it, perhaps we could have managed without it, but since the discovery of oil our economy has relied on it. Our society has been (literally) fuel by oil. It has done wonders for our world and the impact of oil cannot be disputed. As great of a use as oil has been in our short history, it has now become detrimental to use it. These days it is destroying our world. Sure, we once relied on this fossil fuel, but now it's time to start using an alternative energy source.
This doesn't mean we need to start from scratch. We can most certainly keep the things oil has left behind and use that as a way to further our society. Take what oil has given us and find a way to make our new energy source compatible.
Much like oil, religion is no longer needed. Perhaps the human race could have figured out morals for itself in a different way, but we decided to use religion. But just like oil, religion is now doing more harm than good. We've used up this fossil fuel enough. It's time to take what we've acquired and make the leap of leaving religion behind.
We don't need to start a new society. We can take what religion has given us and apply them to today's standards. Our morals, for example. A common argument is that without god there are no morals. Well, we can keep the basic right and wrongs and just leave the religious aspect behind.
In summary, both oil and religion have made society what it is today. But it's time to leave both behind, as they are ruining what they helped create.
Thanks for reading, cheers.