[erklik]

I think it makes sense specifically in this case.

Mainly because Islam has jurisprudence around hygiene in a sense. Ritual purification is an actual religious principle.

Islam requires Muslims to pray 5 times a day, and for those prayers, one has to be ritually clean. That involves washing the hands, rinsing the mouth and nose, washing the face, forearms, head, ears, and then the feet. That's effectively all the major parts of the body that are generally not covered by clothes. Your "cleanliness" is invalided if you use the toilet, pass flatulence, vomit, sleep and so on.

More so, for using the toilet, there are rules. You have to find a place that is away from standing water, people's pathways, shade etc ; granted, this generally doesn't apply in today's age. You have to be quiet on the toilet, and not look at anyone. Not allowed to eat any food while defecating. Lastly and most relevant in this case, you have to use water to wash yourself using the left hand, and then afterwards, you need to do the same for washing the front if you've urinated.

The reason why the "bidet spray" thing exists, is largely because of the rules in the religion around that practice. Calling them Arabic wouldn't make any sense because Indonesia, with the largest Muslim population, has similar tools in their facilities. Again, because they're mostly Muslims.

Printing isn't a catholic thing because the religious doctrine didn't emphasis "printing" itself.

Arabic numbers aren't "islamic numbers" because the religious doctrine didn't emphasise the numbers in some way.