Some people like to say that all religions are basically the same. They then pick out some qualities that appeal to them, like the existence of God, or love, or being nice to people, and say that all religions say this. Unfortunately, this is not true. Not all religions believe in God; those that do have incompatible beliefs about God.
Nor do all religions have the same values. Love and Compassion are central and primary to Christianity and Buddhism, but other religions see other qualities as more important.
The second approach is to say that one of the religions is 'truer' than the others. Some might see Hinduism as the true, ancient religion, and all others as the results of forgetting this truth and falling away from it. Others will see Muhammed is the final prophet, and all previously revelations as incomplete and needing correction. Others would say that if a non-Christian 'truly understood' Christianity, they would instantly convert from their old religion to Christianity.
Both of these approaches fail because the religions of the world, their dogmas and practices, are genuinely different and distinct. There is no 'one religion' that can reconcile them all; it would just be yet another new religion different from the others.
So is there no hope for global understanding? Must one religion triumph over the others, or does science trump them all?
No - there is One Truth and it underlies all religions. But it is not intellectual and it is not a matter of laws for behaviour. Truth is within; it is approached through meditation and expresses itself through revelation and inspiration. It has expressed itself in Gnosis, Theosophy, Hermeticism. It is understood through the eye and ear of the Spirit, not the separative intellect of the human brain, yet it is remarkably constant throughout the centuries.
You do not need to give up any religion - or science, if that is your creed. Start from there and go within, and you will find the One Truth. Having climbed to the top of the mountain up one particular path, you will look down and see many others leading to the same summit.