The creation of angels is referred to in Psalm 148. Of their nature we are told nothing. They are created beings, with a nature not of flesh and blood like humans. It is evident that they bore the human form, and could at times be mistaken for men, but it is interesting that they never appear in female form. The familiar conception of angels being winged creatures does not find any support in the scriptures.
Angels are angels, and humans are humans.
While we possess a spirit, we are also fleshly. Angels are not. We do not become angels in heaven, for once a human, always a human. Some have misunderstood the teaching of Jesus on this subject. In these passages Jesus is dealing with the subject of marriage.