I'm assuming you have a sarcastic tone on this, but being the literal ninny I am, I will be forced to answer.
He cut them off when he landed, before meeting anyone. I presume so he can 'fit in' while looking for Ms. Preggers. Appearance and 'not freaking everyone out' would be the only reason I can give beyond his 'defying God' mission and perhaps it was a statement towards that as well?
Final boss fight was between Gabriel (wingless) and Michael (winged), so they had enough CGI budget for one guy, at least. But visual cues to help separate opponents in an up-close brawl are often utilized, and wings would be a good indicator of who is who.
Dammit...I am certain you are sarcastic, and I hate that I can't deflect with some witty reply, that I must in fact state the facts. This is what it's like to be hard wired for certain things - makes me dependable, and predictable/manipulatable.
Also...
for making me think any further on this pos film.