Winged angels aren’t a Christian idea at all. In fact, the oldest depiction of a winged human motif dates from Sumerian society, which flourished around 3,000 BC in what would be present day Iraq.
“The religion of these people was complex, embracing a wide variety of spirits and gods, but of particular interest was their belief in ‘messengers of the gods’, angelic forces who ran errands between gods and humans.”
“The Sumerians also believed that each person had a ‘ghost’ of some sort (that we would now probably label as ‘guardian angel’) with this entity remaining a constant companion for a person throughout their life. Altars that appear to be dedicated to guardian angels have been found in the excavations of ancient Sumerian homes, along with stone engravings and temple wall paintings of human figures with wings.”
“After the polytheistic Semitic tribes had conquered the Sumerians around 1900 BC their mythical cosmology borrowed the notion of angels from the vanquished Sumerians. These Semitic peoples developed the idea of a corpus of angels split into groupings answerable to each of the many Semitic gods, further subdividing these groups into vertical ‘ranked’ hierarchies, a notion which persisted into Zoroastrianism and monotheistic Judaism…” citation
By the way, there are quite a number of things we think of as uniquely Christian which are actually imports from earlier religions. For example, the ideas of an immortal soul, the phrase “everlasting life,” and an afterlife appear to be Greek in origin. The idea of an afterlife does not appear in Jewish thought until the Book of the Maccabees, but is not widely accepted until Alexander the Great conquered the Israel.
The ideas of a Divine Father and a Divine Son, the Garden of Eden, the concept of the first created humans Adam and Eve, the Resurrection, an apocalyptic final confrontation between Good and Evil, the Day of Reckoning, Heaven, Hell, devils and angels, the belief in a Messiah, are all imports from Zoroastrianism, which flourished all throughout Persia at least a millennium before the Old Testament.
Zoroastrianism was an offshoot of the same religion as Mithraism; which also had a Messiah; who was born of a Virgin on December 25; who performed miracles; had Twelve followers; was killed and resurrected after 3 days; who was regarded as Mankind’s savior; referred to as the Light of the World, and the Lamb of God. The concept of saints depicted with halos of light were also Mithraist in origin. In fact, the idea of a crown is based on the halo, whose reflected light is intended to depict the favor of Mithra, the sun god.