I know Christians believe Mary, the mother of Jesus, was a Virgin, as we do. How could she be a virgin from your faith if Jesus had a father..........God?
Mary was a virgin because she never knew a man (well untill she married Joseph)

How could a woman have a son with God?
Mary didn't have a son "with" God... God used Mary to carry Jesus so he could be born..

Do you not believe Jesus was a human being?
hmmm... i believe Jesus was God in the flesh.. so in a way yes...

How could God Almighty have a son like a human being?
exactly like you said ... He is God Almighty... he spoke this universe into existance... He can do anything