Just because something is narrow and exclusive does not make it wrong. Life is full of things that are narrow and true. For example, we want the airplane pilot to land on the runway, not the highway; to land right-side up, not upside down. Truth is always exclusive of error. Two plus two equals four is very narrow, but it is still right.
The same is true concerning the words of Jesus Christ. He said that the only way to God is through Him.
Jesus said to him, "I am the way, the truth and the life. No one comes to the Father (God) except through Me."
Jesus's words tells us to repent and believe. Just as two plus two equals four is true, Jesus words are true as well.
(Jesus) saying, "The time is fulfilled and the kingdom of God is at hand. Repent and believe in the gospel.
...He who has ears to hear, let him hear!