That's one opinion...
If every church, synagogue, and mosque in the world disappeared tomorrow the human race would be far better off. Karl Marx wasn't right about much but he was right about that.
I don't know. I'm pretty sure the world is a better place because my church down the road is in it. There's a lot of good people, and good things being done.
On the other hand, having every Marxist disappear might be a pretty good choice, too. I don't know how many people have been murdered in the name of religion in the last hundred years, no doubt more than a few, but Marxism murdered almost a hundred million.