John says his Gospel was written so that readers may believe Jesus is who?

Answer: The Christ, the Son of God

"These are written so that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life."

“Jesus performed many other signs in the presence of His disciples, which are not written in this book. But these are written so that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in His name.”— John 20:30-31 (BSB)