Nirvana, non-duality, karma, dharma ~ all the same though naturally varying according to the given school.The thing is though they really dont always end up at the same beliefs, a great deal in common mind.
I’m just saying that religions all have a teleology, one based on some manner of assumed and/or learned end. If you don’t think you know the answers, then what does one base a religion upon?
I agree with your general sentiment, but Islam can be coupled with other religions, even Christianity can [e.g. voodoo]. I admit that it was/is far more flexible on the matter though. I wish Christianity had been less exclusive, then we’d know a great deal more about our own roots and beliefs.Buddhism can be coupled with religions though. Look at Shinto-Buddhism.