he's a God, not a slave. he won't grant your wishes, but he may look favourably upon you. if you show love and devotion to any deity they may reward you because they have a close bond with you and see your struggles and your kind deeds. now, not all deities act the same, and Anubis probably won't give you everything you wish for because you said please. [he seems like the type who would protect you, but make you work for things] my Goddess is very loving, but can dish out tough love sometimes. if i was to walk up to her every week and ask for stuff, i know she would teach me a lesson.
side note: you are wondering about granting 'any' wish? another no. Gods can look favourably upon you and you might find yourself with a sudden promotion to help your money problems, but a God will not make a random money shower appear in your living room. it still has to be part of nature. you can normally tell when a deity intervened because you prayed for something. sometimes you're suddenly think of your deity or you will see their symbol/animal at the same time or very soon after receive your requested thing. it's hard to say exactly what will happen, you just get a strong feeling that your deity helped.