As many people hear this, some remark that religious truth should seek to be as provable as mathematical truth. I happen to be in this camp often when I argue that it was the Age of Enlightenment which created this bifurcation of truth and since then, its proponents have criticized religious truth as not valid.
However, lately I have heard that even mathematical truth is cultural. The argument is that we should not expect every culture to be as enamored about mathematical truth as the Western World, or the Japanese and the Chinese cultures. When one listens to this type of argumentation, the proper way is to ask "When did we decide that two plus two is a universal truth?" However, the argument is not when did became a universal truth, but if the people everywhere like this concept.
The biblical concept of religion is presented with mathematical truth. No one could miss it.
When God gives the Decalogue (Ten Commandments) to the Jewish nation, he tells them that there is no other God. He is the only God and they should worship Him and only Him. The Israelites were surrounded by other religious entities, which God called idols and not gods. One of the most impressive demonstrations of the singularity of only one God is the encounter between the priests of Baal and the prophet Elijah. Even though the true God has answered by fire and consumed the sacrifice, the people continued to worship idols instead of God.
When Jesus talks about other religions, He tells us very plainly: I am the way the truth and life: no one comes to the Father except by me. This is probably one of the most uncomfortable verses in the Bible and some claim it as the most exclusive verse. At the same time it can be regarded as one of the most inclusive if Jesus is indeed the only way to God. If Jesus is the only way to God I want him to tell me as directly as He can so that I will not waste my life here on earth or my eternity.
Later on, Paul focuses on the uniqueness of the Gospel. The main story of the Gospel is the Good News about Jesus Christ. Jesus Christ suffered, was crucified under Pontius Pilate, was dead, buried and rose from the dead. He ascended to the right hand of God from where He shall return to judge the living and the dead. For Paul there is no other gospel because there is no other Jesus. He tells that even if angels should come from heave, that believers should not listen to them.
I think that somehow we have reached mathematical truth. This mathematical truth is the same everywhere. Religious truth is the same - Jesus is not the Redeemer of only Christians; He is the Redeemer of the whole world.