If I may add a bit, here....
Christians believe Jesus was/is God because Jesus made that claim, and the Jews of his day clearly understood him to have made that claim. In speaking about "The Father", Jesus said, "The Father and I are One". Not much of a claim to out minds, but look at the reaction of the Jews. They picked up stones, to stone Jesus, and he asked them why were they about to stone him, and they replied--"..but you being a mere man claim to be God" They got what he was saying, and being good Jews, were going to carry out the prescribed punishment--stoning until dead.

There are many other arguments that can be made, but, like this one, they rely on the Scriptures. If you reject the Scriptures, then there is little to discuss.

__________________
1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags