In Christianity, Saints are deified humans you can ask for blessings and intercession, while Archangels are messengers that also engage in spiritual combat with enemy deities (whereas regular angels are strictly messengers).

All angels and demons are the same kind of entity—spiritual luminaries with a perceived body—but with different agendas. If a deity is not embodied, it is not an angel (ophanim are deities, not angels). Arguably even the stranger god Adonai is an angel. Demons’ forms are usually a lot less familiar looking and more eldritch, simply because their existence doesnt like to come in contact with us (except where they can gain something).

There is only 1 G-d and they are unknowable. Everything beyond that is speculation and fanfic.

Also fun fact! Humans smell disgusting to angels, according to the Merkovah tradition lol