Top Ten Most Underrated Inventions

First, religion is an invention?
Second, it may as well be overrated, not underrated. Of course, this depends on how religious you are. But most people are pretty thankful for their religion, so I don't think it's underrated at all. If you're irreligious, then religion is even less underrated.

The first God is Nammu, Goddess of the primeval sea.
The Bible is a written book by man who knows? we don't have time travel.
All the far-fetched stories well probably in times when there wasn't much education around.

Calling religion an "invention" is a wild stretch. While certain sects have been "inventive" in their approach and interpretations, religion is an IDEA, whereas an invention is a man-made, physical manifestation of an idea. In short, religion is NOT an
invention.

And yet, we somehow managed for millennia without it.

Yeah when for years people used old newspaper.

No one invented microwaves. You must be talking about the ovens.