Devas as gods in buddhism ,is it a corruption of original teachings..?
In buddhism there are 31 realms of existence and each realm is inhabited by beings: animal, petas, asuras, humans, devas, brahmas.

Now these are just inhabitants: beings with different appearances and abilities according to their kamma.

Now if we translate brahma as god then it is different form the Hindu brahma in that the buddhist brahma does not create the universe etc.. buddhist do not unite with brahma in the end. Buddhist brahma dies after a few hundred aeons etc... 

These are some of the definitions of the buddhist brahma which is different from the Hindu brahma.
See Buddhism and the Brahma concept