On other hand why he do fasting in the middle of important games? He's an athlete he needs more energy and might that one can affect him since for not eating he might lose focus also cannot perform normally as we see he plays before. For game 3 I will bet on Nets since I expect they can perform more better since if they lose again this time maybe this will totally affect them and might they will sweep out by Boston on this series.
That's a religious thing that he believes he should do. It is also a bit of a weird thing because he is fasting to go to heaven according to his religion, but then goes out and swears to fans of celtics.
I mean doesn't that break all the purposes of being a good Muslim? If you fast but then go out and say "suck my d--k" to someone, then why do you even fast? Aside from that, any player has a right to living their religion however they want, I wouldn't care, if he is playing badly because of it, then it's teams decision to sit him out for playing badly, but if he is providing good results then it's not something anyone should care about at all.