If Jesus were God ....................?

and the christians are his children (as are addressed by Him), then christians must be god themselves. Because Jesus is a son of God which makes him a God. And as christians are his children so in the same logic christians are also God. So christians must be the grandsons/granddaughters of God according to their book. Besides why God has one child? If Jesus was a god how come he could be killed? Gods can't be killed. God should be one. Otherwise there would be lots of fighting among them according to the greek/indian mythology. Because then there would be lots of clash of egos and stuffs like that. Why are there 3 Gods? How are the responsibilities distributed among gods? If gods can be born then they can be dead also. If Jesus was born from God, then who were God's parents?