Oh yes.... depends on what your definition of magic is. Is not a prayer a ritual. is not an answered prayer the result of something magical?
A prayer is ritual, but it's a petition, a request for something. Magick refers to doing a spell, not to ask for something, but to make it be that way. That's the main difference between the two.
A prayer to a Saint or to the Christian God automatically includes that person in your "spell" (for lack of a better word). If the higher being decides that what you are petitioning for is not to your benefit, your request will be denied. When a magick spell is done, there is no asking. The spell is done with the intent to cause the desired change and, if done correctly, the change will occur.
For this reason, a large percentage of witches do not evoke deities for help with their spells. It seems like it would be beneficial to do so, but if you think about it, what if the deity (who now has a hand in the outcome of the spell because you gave them permission to) decides that it would be better off it you didn't get what you wanted? Or worse yet, if you got what THEY wanted you to have? Some deities have awfully warped senses of humor sometimes, and it's safer to keep them out of spellwork.
Christians don't have that advantage. They are not allowed to demand anything of their God. They must petition for his help, and then what he says goes. If he wants them to have it, they get it. If he doesn't, they dont.
There'a huge difference between prayer and spellwork.