Yeah, I can see why Negi would recommend this manga. It's literally Toubun minus two girls.
The MC sounds like a shitty fifteen year old atheist you'd find in r/atheist or atheism, I can't remember.
The salt gag was just way too overused.
Also, 3 ecchi cliche scenarios in a single chapter, very original.
The pacing is just hella whack for a one shot.
If I was an editor, I'd have told Negi whatever the author's name is to make the MC be polite, but have his anger be really deep inside of him, waiting to blow up when one of the girls do something religious or something.
The plot is salvageable, but it'll probably end up being a manga that'll get axed in 4 volumes or last for 20, no in between.