I'm not sure that the Hindu caste system would lead to a more equitable and tolerant society. The results in India are catastrophic for so many.
In terms of other religions, I think that the proliferation of them points to a shared human consciousness and reaching for God. Many are searching - yearning - for something more, and the human construct of religion has come about as a result of this soul-deep need for reconciliation with and relationship with God. Therefore as Christians we can't judge those of other religions and find them wanting, but we can tell them about what we believe to be truth, if they should want to know. St Paul did this with the Athenians and affirmed their faith and their search for God, then made clear to them the answer they were looking for (the worship was to 'an unknown god') - as he saw it.
I know that claiming 'truth' can seem arrogant in itself, but if you think about it, other religions are claiming truth and atheism is claiming that none are true, so none are really holding out these tolerant values which seem so desirable. The difference, I believe, with Christianity, is that it is for everyone, as Insieme says - held out to everyone, inclusive to all and bringing those who believe into freedom and human flourishing. It's not a tribal religion but a belief based on historical events and claims that can be held to historical scrutiny rather than a personal account/visitation of its founder. Claims which could be verified from the start.
I'd hate to treat religion as a game of chance - spin the wheel, roll the dice, and there's your truth. I know it can seem like it must be this way as so many believe so many different things, but for me Christianity accounts for human purpose, value, dignity and morality as well as for the cosmos more than any other, so yes, I do believe Jesus is the 'only way'. However, I also know God is far bigger than my imaginings, and that God is perfect justice, and therefore those seeking God will find God, and 'through Jesus' doesn't have to mean they have even heard of Jesus. Jesus is the means by which we are reconciled to God, but not all will have known his name.