How can Jesus be the Only Way?
Here is a well done video by Reasonable Faith that deals with Christian particularism (or Christian exclusivism), i.e. the Christian view that only the way through/via Jesus Christ leads to God and reconciles with God. This view asserts at the same time that the other ways promoted by the various religions and beliefs, which are unlike this way, do not lead to God and do not reconcile with God.
The view of religious pluralism, i.e. the world view that all world views have the same value, is in contradiction to Christian particularism. Religious pluralism is also sometimes expressed by words like "There are many ways to God." or "Everyone will be saved according to his own standard."
Here are three scriptures that provide evidence of Christian particularism that I will briefly comment on:
God speaks through Isaiah: For thus says the Lord, who created the heavens (he is God!), who formed the earth and made it (he established it; he did not create it empty, he formed it to be inhabited!): “I am the Lord, and there is no other. I did not speak in secret, in a land of darkness; I did not say to the offspring of Jacob, ‘Seek me in vain.’ I the Lord speak the truth; I declare what is right. “Assemble yourselves and come; draw near together, you survivors of the nations! They have no knowledge who carry about their wooden idols, and keep on praying to a god that cannot save. Declare and present your case; let them take counsel together! Who told this long ago? Who declared it of old? Was it not I, the Lord? And there is no other god besides me, a righteous God and a Savior; there is none besides me. “Turn to me and be saved, all the ends of the earth! For I am God, and there is no other. Isaiah 45,18-22.
The Lord is saying here that He is the only God, and thus there is no other God besides Him. In one word: monotheism. The man-made gods who are not true gods cannot help, but the true God can help. God is Savior and apart from Him there is no Savior, no one who can save. God saves us when we turn to God.
Jesus says: I am the way, and the truth, and the life. No one comes to the Father except through me. John 14,6.
Jesus says here that Jesus is the way. Jesus is the way to the Father and Jesus is the only way to the Father, so the only way to God. All other ways which, according to the various religious ideas, are supposed to lead to God do not accordingly lead to God.
The way can mean different but related things: On the one hand, that Jesus' life path leads to God, so everyone who follows the same path that Jesus walked, i.e. lives according to Jesus' example, will come to God. So whoever, among other things, believes in the God of the Bible, lives according to God's commandments, confesses the truth, etc. is treading the path to God and will (or is) be with God.
On the other hand, Jesus can mean the way as his substitutional sacrifice for man's sins, through which alone access to God opens up, which was closed by man's sins (compare e.g. John 1:51). Jesus is the way to God that was only made clear through Jesus' sacrifice, and without Jesus' sacrifice there would be no way to God because man's sins would make the way to God impossible.
Petrus says about Jesus: And there is salvation in no one else, for there is no other name under heaven given among men by which we must be saved. Acts 4,12.
Peter says here that salvation can only be found in Jesus. There is no alternative for salvation, only Jesus. Only faith in Jesus leads to salvation, to eternal life, to eternal happiness. True, deep happiness can only be found in Jesus.