Glas and Cromm

mainstream refer Glas as god of destruction, and fallen god.

mainsteam refer Cromm as god of unending darkness (but claimh solas absorbed the darkness, causing cromm to lose power)

do you think this is the exaggeration by people, or really gods? (or formerly gods)

Sounds more like an exaggeration.
They also refer Lugh as a God but more commonly a Knight.

They constantly refer to Glas as a god from outside of Erinn.