It sure seems like it. Jesus, the earthly manifestation of God, talks peace, love and forgiveness. He tells us to love our enemies and preaches the golden rule.
The God of the OT gives laws to his people that command them to kill gays, adulterers, children who talk back to their parents, etc. He commands Abraham to kill his son. He floods the earth to kill every last man woman and child because they displeased him. He destroys Sodom and Gomorrah with fire and brimstone. He helps the Hebrews win wars and commands them to slaughter every man, woman, child and animal in nations that do not believe in him.
Do these sound like the same God to you? One sounds like Ghandi and the other sounds like Hitler. When discussing this with Christians, they often tell me that Jesus brought a new covenant and that God changed the way He deals with man. But this is no minor adjustment. God goes from egomaniacal mass murderer to peaceful, loving father in a single stroke. If He did change, WHY? If He's perfect, why do it one way for a while and then conceive of a BETTER way so much later? Wouldn't a perfect being do it the best way first and never have to change his mind?