Who told you that?
Jesus is not a god for christians. Hes gods son, but still a human (although that might not be correct for some of all those christian churches..)
The christian god is said to be the same god as the muslims and jews god.
After all, those 3 religions are monotheistic, so there can be only one god, so it MUST be the same one. logic at its finest..hm?
Every one of them only state that their way of following that god is the right one.