Religious pluralism is a belief system that sounds good, but does disservice to all religions. All religions are exclusive. Even naturalism, which poses as irreligion, is exclusive. Every religion has its starting points and its deductions, and those starting points exclude. For example, Hinduism has two non-negotiable beliefs: karma and reincarnation. No Hindu will trade these away.
In Buddhism, there is the denial of the essential notion of the self. Buddhists believe that the self as we understand it does not exist, and our ceasing to desire will be the cause of the end of all suffering. If we deny these premises, we deny Buddhism.
Naturalism teaches that anything supernatural or metaphysical is outside the realm of evidence and purely an opinion, not a matter of fact. Islam believes that Mohammad is the last and final prophet, and the Quran is the perfect revelation. If we deny those two premises, we have denied Islam.
In the Christian faith, we believe Jesus is the consummate experience of God in the person of His Son, and is the Savior and Redeemer of the world. We cannot deny these premises and continue to be Christians.
The question is not whether these are mutually exclusive. The question is which one of these will we deny as being reasonable and consistent? Which one of these will we be able to sustain by argument and by evidence? We can have pluralism in cuisine, clothing styles, accents, and other things. But if pluralism means ideational relativism and the destruction of the law of noncontradiction, it is absolutely unliveable and unthinkable.