They are considered seraphrims officially, but the variance between traditional 'angels' and pop cultures is huge. So much has been altered for image and perception they arent really the same.
I believe in the hierarchy, they rank at the top, just under god himself.
As per your question regarding prayer to one, while i dont believe in that, the mentality is that yes they have limited ability to answer and help, much like saints and such.
Surely if you could pray to lucifer, another seraphim, and he answer, you can do the sae to the others.
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Technically, you do not pray to Saints, but through them. When you pray to a Saint, you are basically asking them to pray for you to God. The same would apply for angels I imagine. And praying to Satan would be a bad idea...
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Never did me any harm, its not like i ever got an answer when i did care either way.
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So, they're ranked below God, yes. But does that mean that they are, in other name, lesser gods themselves?
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Nope. In the Christian faith, angels are servants of God, and they example how a Christian should act.
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Thats hard to tell, maybe a demi god of sorts.
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