Thats one nasty ass motherfucker.
Your post took a weird turn with the terrible BO lol, I assume the religion question would been the fasting, usually during Ramadan, but some do voluntary extra fasting in different times in the year, my mother does it on some mondays and thursdays at times.
Are you sure this guy isnt a total junkie and you guys just havent noticed? In my experience, people who completely and suddenly let their personal hygiene go are most likely hooked hard on some drug that leads them down the disgusting bum path.
Genuine question, why fuck would you think not showering for ages is a religious matter? LOL. Dont know about other religions, but islam in particular has total OCD about cleanliness. When you pray 5 times a day, you wash up repeteadly in speficic order and ritual, and you repeat it multiple times for each prayer, 5 times a day.
Someone who is that glaringly odious is never ever doing his prayers lol