While Im not religious, I have a feeling that your God will not get mad at you for playing a game where a character prays. Its not you as a person truly believing, following, or claiming to believe or follow, another deity. I do believe many posts in this thread are a little overly agressive towards you, I agree with the general consensus that its not something you should really be qorrying ahout. Its akin to watching a television show where an Islamic character praises Allah.
If youre really that worried about it, then just do a 3-heart challenge. Cant be easy but I wish you luck in such an emdeavor if you choose to do so