Do Muslims and Christians worship the same God? The answer lies ultimately in what someone believes about Jesus. Is He merely a great man and prophet or is He the Son of God? Jesus said "Whoever does not honor the Son does not honor the Father who sent him." John wrote: "Who is the liar but he who denies that Jesus is the Christ? This is the antichrist, he who denies the Father and the Son. No one who denies the Son has the Father. Whoever confesses the Son has the Father also." 1 John 2:22-23
In this passage, Jesus uses Psalm 110 to explain how the Messiah would be more than just a man. He could only be David's descendant and Lord if He is the God-Man. The Son of God became human so that He could save us.