I'm considering reading "all religions are one" william blake. Better recommendations for a deep dive into perennialism?

What is the difference between Perennialism and Perennial Omnism?

I have a relatively introductory understanding of Perennialism/Traditionalism. I know Traditionalist writers believe in the Absolute, to which all authentic Traditions, including authentic versions of Islam and Christianity, lead.

Have Traditionalist writers written on exoteric contradictions, namely Jesus Christ's divinity and death on the cross and the contradicting teachings of Islam and Christianity on the matter? If the Quran says, for example, that those who believe in a Trinitarian God are disbelievers and will be punished if they continue in this belief (5:73), to desist and not say "Trinity" when referring to God (4:171), how could it be that both Islam and Christianity are valid paths to salvation? I've read a bit of Schuon, writing to resolve the conflict between the doctrines of the Trinity and Tawhid on a metaphysical level. But if Islam tells people not to believe in the Trinity, wouldn't either Islam or Christianity be a true exoteric path to salvation -- not both -- as according to one tradition, the other would lead you to damnation? And, if Traditionalists hold both to be divine revelations, why would they be in conflict with each other?

Of course, Islam and Christianity also disagree on whether it was really Jesus who was crucified and died on the cross. What do Traditionalists think about this disagreement over historical fact? Islam and Christianity cannot both be correct in their interpretations. How can a Traditionalist say both traditions, in an orthodox form, can lead to Truth? Have any Traditionalist writers written on the matter of the Islamic-Christian disagreement over the Resurrection?

Thanks!

I am so happy to have found a community that shares this "un-popular" way of thinking.

Peace to ALL !

What if religions, faiths of the traditional types, e.g. Christianity, Judaism, Buddhism, Islam, etc, united ? What is needed? What common grounds? Will this provide people power across our globe? Not to do away with traditional faiths/religions, rather a move to bring what is a primary in many faiths: peace, transcendence, unity, harmony, including social solutions, such as: eradication of hunger and poverty, war ultimately and more. Is this possible? If so, how?

I’ve never heard of Perennialism before. I stumbled on this sub by accident. I have to say when I read the definition of the word, it became one of my new favorite words. Very interesting word to say the least.