Is it true that Christ himself said He was the God we know from the OT? If that is true then isn't it also?

Yes, Jesus is God, and He claimed to be God. Any belief other than that is heretical. See my articles at a href="http://christian-contemplate.blogspot.com/2011/02/jesus-is-god.html" rel="nofollow"http://christian-contemplate.blogspot.co…/a and a href="http://christian-contemplate.blogspot.com/2011/02/natures-of-jesus-christ.html" rel="nofollow"http://christian-contemplate.blogspot.co…/a