@ Sabby (and Mr. Sin might as well consider this some kind of reply too, this post has some elements of what I'd say, I'm done for tonight and I don't feel like getting too invested to be honest, I'm not hardcore into this kind of stuff)
I highly doubt you would agree with it, but I guess I'll give my 2 cents.
It's obvious that there are the frankly dumb folk in religion firstly (but not all religious people), just getting that out of the way, now it's hard and maybe near impossible for me to talk about the world as a whole in this manner because they're are multiple truths, so I will look more at a specific level as it's more realistic. Understand that if you asked the same of me on behalf of atheism my kind of response would be no different, that's just how I roll as an individual.
Christianity can offer enlightenment and creativity amongst other things to people, of course you can find these things in other numerous ways but there are people who find it in Christianity, therefore who are we to gain say them? My specific example is a 20th/21st century Canadian named Bruce Cockburn (I think it's not actually pronounced like cock), a name that has shown up in my time at the school of environmental and natural resource sciences, Cockburn has had a musical career for over 40 years. Cockburn's lyrics reveal his passion for human rights, politics and Christianity. Cockburn was raised agnostic but in his early career chose to be a Christian to this day.
It's from Christianity that he found much of his inspiration in his early musical career, evident in his lyrics referring to his belief in Christianity especially in the 70's, and was accompanied by lyrics concerning/advocating human rights and environmentalism.
That is as realistic an answer as I can give, because "What has Christianity done for thee world in the 21st century" or even the same question but with atheism are just not good questions in my opinion. What should really be observed is how individuals interpret and use such things and how this has effected their choices in life, such as Cockburn's musical direction and advocating for human rights and environmentalism. After all, religion is just sitting there until the people choose otherwise. Ultimately, I doubt everyone would agree with this but as the saying goes "different horses for different courses".
I'd at least like to conclude my post with something that, unlike the rest of the discussion here, is genuinely interesting to me. The religious views of Albert Einstein. From what I interpreted, he basically threw religion and atheism into the same basket, because though they are polar opposites they are both the same in that neither can be scientifically observed yet insist on being legit regardless. Einstein was humbly content with the knowledge that our knowledge is imperfect, he associated himself with pantheism and is also viewed as agnostic. It's at the least a very interesting perspective and even pantheism to me is an interesting concept.
