Well, are they? Some other religions have lesser gods, and a supreme god. Is this the same in the Abrahamic tradition, just under another name?
Not saying you should, or that these angels/gods would, but in a hypothetical situation if you were to pray to an angel for something would it have the capability of answering said prayer?
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Every religion has a different view of them. In mine, they are pure beings, who were created to obey God. Some of them have specific roles and they cannot answer prayers.