The Rambam's 13 Principles of Faith with Rabbi Noach Gruen

Principle 8 (pt 4): You can't make this stuff up!

Noach

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Christianity and Islam never dared deny the revelation at Sinai. Instead, they acknowledged it but said Hashem just "changed His mind." 
But why didn't they just say the Sinai event never happened?
A powerful tour through the Kuzari's exposition of our emunah in Torah min hashamayim.