Can confirm that angels, despite being found in the Sikh and Zoroastrian faiths (whereas the latter influenced Abrahamic faiths and the former contains a direct reference to an Abrahamic Archangel in its Guru Granth Sahib), are primarily an Abrahamic construct.

As far as I know, the sole reference to 'angels' in Greco-Roman religious culture was in the 4th century Christian-era musings of Proclus on Plato's Timaeus, where he assigns the adjective 'aggelikos' and the term 'aggelos' to sous-divine metaphysical entities.