Not sure but like pigglypoof, I also me think of
http://www.mangago.zone/read-manga/concrete_garden/
thank you, you've given me something new to read :D but it's not what I'm looking for.
what I remember is limited, but the MC always refer to the creation of the world in Genesis when comparing his life (yes, his life I think). and maybe about 'how could God create the world in 7 days, and that's why it's so...' what I don't remember. hahahaha if you know such story like that, please tell me. thank you again :'D
Oh I'm not religious so its only with your new comment that I'm realising what you're talking about. In this chapter: http://www.mangago.zone/read-manga/links/sa/sa-c003/
The MC relates what's happening in his life to the book of Genesis. He doesn't end it with 'how could God create the world in 7 days..." though so probably not what you're looking for but perhaps you'll still like it. I feel like I remembering reading what you're describing though where he like laments over the world at the end with that line.
I don't remember the title, the mangaka, how the character is portrayed and illustrated, and whether it is a series or oneshot. What I know is, ofc, it is yaoi (or shounen-ai).
All I remember is that the character in the story compare his days (or his life-related) with the genesis from Old Testament.
anyone knows? I really want to read it again. any helps will be appreciated. as far as I remember, there are exist two stories with such notion and I believe I've read them both but I can't remember. Whichever it is, I wanna read it. If you found more, I'll be more than grateful. Thank you in advance :D