...We need to mature to the point where we can see that there is truth in every religion and there is...
When we look at the reality of how a religion is practiced, we see many variations. Why is this? If the original God-given message, if there ever was such a thing, was the true way, then why mess with it? Are the true teachings of religions corrupted by the "traditions" of men?
Or, were somewhat true things always mixed in with traditions from a culture to come up with a religion that fit the times? So really, how much is from a divine source and how much is from people? Look at ancient religions that made their leader divine. Who really decreed that? God? Or people? Somehow, somewhere, some religions were just a man-made thing made up to help that culture maintain it's order. The rulers were divinely ordained and the masses were expected to obey. Did the real God plan this, or was it people that devised this?
Like the religions that had sacrifices to the different gods. Is that the truth from the One True God? Or, did people come up with that on their own? Was that one of the "temporary" laws of God that changed when humankind advanced and was ready to progress spiritually to the next level? I doubt it because the Abrahamic religions all call those polytheistic, idol-worshiping religions as false.
In fact, one of the prophets of the True God killed the prophets of one of those idol-worshiping religions. So where is the progression? There was a progression, but not because the older religions had "some" truth to them, but because they were wrong, totally wrong, and accused by the "True" religion of the "True" God as being evil.
But then, how great was the "real" religion of God? In an ancient civilization that had human sacrifices to their gods, Europeans brought Christianity. Some were Catholic. Some were Protestant. They killed, conquered, enslaved and outlawed the practice of the old religion. Was the new one the perfect Word of God? Did it bring the perfect Law of God? No, both the Catholics and Protestants had a religion based on their interpretation of the Bible. So the old culture of the conquered people was destroyed, and they were pretty much forced to accept the God of the Europeans. A progression? Sure. Much better than the old ways. Perfect? No.
So where is the "progression" from one dispensation to another that the Baha'i Faith talks about? All people and cultures fought to protect and spread "their" truth. The dominant culture spread its truth the best, and it did include killing. It's more like the "survival of the fittest". I don't know, but I'll bet you the Europeans tried to get rid of Hinduism in India and get them all "Christianized". So where is the "oneness" in religion? Too many of them thought and were taught that their religion was the best and only truth.