No group, no people, no institution, no religion, has ever (until the last few hundred years)denied Har Sinai.
Baloney. I’m willing to bet that Hindus, Bhuddists, pagans, et al, throughout the years denied Har Sinai.
Unless, of course, you’re restricting “religion” to Abrahamic religions, in which case your argument becomes “No True Scotsman…”
The Wolf