I'll cut right to the chase. He isn't just another person who makes a positive impact on the lives of others. He didn't just hang out for a while to teach us how to love. He is God in the flesh. He died for us.
Jesus claims who He is (John 10:30). Jesus performed miracles (John 14:11). Jesus led a sinless life (John 8:46). Jesus prophesied (Luke 24:27). Jesus resurrected from death (John 2:18-22).
Jesus was punished for our sins (Isaiah 53:5). Jesus substituted His life for ours (1 Peter 3:18).