How can you know for sure if Jesus is the way?

Test out the teachings he gave. Jesus spoke nothing but truth (1 Peter 2:22), so whatever it was he said can be depended on. Everything that he taught was told to him by Jehovah God to teach to others (John 7:16-17), which is an even greater guarantee that it's worth listening to, since Jehovah can't lie. (Titus 1:2)

(New World Translation of the Holy Scriptures)