I agree with you. Jehovah/Allah=same thing. If you're Jewish or Christian, my God is your God (even if you don't know it and thinks it's Jesus, s.a.w., who was not the son of God, but a great prophet, born by Virgin Mary).
Hinduism has the Vedas, Mormonism has the Book of Mormon, Scientology has the Dianetics and Pastafarianism has The Gospel of the Flying Spaghetti Monster.
How can you know that the scripture of those faiths are not just written by humans? They contain scientific errors, contradictions, etc. They're nothing like the Quran atsch
Because no human from the Arabian desert in the seventh century could write something like the Quran. The Quran had a lot of scientific knowledge that no human could possibly have known at that point in history. The Quran knows about Big Bang, the expansion of the universe, the early stages of the universe, the rotation of planet earth, the depths of the seas, the roots of the mountains, the different circuits of the sun and the moon, etc. Besides, Islam can also be proven by using the Bible.