Is Jesus on the cross the same God who created the world in Genesis?

In the context of Jesus' cry from the cross, 'My God, My God, why hast thou forsaken Me?' after three hours of silence, Les explains that this was God speaking to God, as Martin Luther eventually concluded. Les emphasizes that the Christ of the cross was the same God who created everything in Genesis chapter 1, one and the same, and the New Testament constantly gives Him credit as Creator. He notes that many believers are not aware of who Jesus really is: He is the Creator God. Les also mentions a letter from a Muslim listener who argued Jesus was never God but only another prophet.