I’ve come to speculate that most ancient religions or belief systems outside Christianity and Judaism contain a portion of truth but from another perspective, that of the great men of old, men of reknown who founded them. There are many curiosities in Hinduism in particular, when viewed from this perspective, beginning with but by no means limited to Vimanas. A reading of several extra-Biblical works from Qumran, known collectively as The Dead Sea Scrolls, would seem to reinforce this.
I believe that valid paths, hinduism, buddhism, basically all world faiths except for Islam were given by God when man asked for meaning..he did not lie to mankind..however, God judges our successes by our attention to Him and our willingness to recognize how sin destroys us. Given that God saw that all knowledge and paths laid out were not being walked..no one did what he asked..So, before destroying the creation and starting again..Christ knew of God’s love for us and volunteered to come to earth in a last attempt to reach mankind about our beings and relationship to God..
At that moment God severed all paths laid before from himself and declared there is no other path but through Christ that we may be saved due to the love and sacrifice of His son..A severed path does not mean the truth in it is negated, it means it is unfulfilled and will not yield the result we are seeking..it is a big deal to God when men now choose to deny Christ sacrifice for us..we cannot stand on what we have done, only by being washed in the blood of Jesus can we be fulfilled...
My take is a little different. Rather than thinking of founders, I think Judaism itself grew out of the more ancient faiths like Zoroastrianism and there are bound to be commonalities between the ancient faiths and Judaism/Christianity. Zoroastrianism for its part is said to have a lot in common with Hinduism.