Quantummushroom,
“The point is that there are thousands of religions in the world, contradicting each other, and solely on the basis of the mutual contradictions most of them have to be wrong.”
You’re conclusion is indeed correct!

If all the religions have their origin from the Creator, [proof for a Creator, see my blog: bloganders.blogspot.com (left menu)) it implies that the contradictions betweens the religions reflect a self-contradicting Creator.

No eminent scientist represents that our perfectly-orderly universe can be explained ex nihilo without a Prime Cause.

Being logically consistent (orderly), the universe must mirror its Prime Cause / Singularity-Creator—Who must be Perfectly Orderly; i.e. Perfect. Therefore, no intelligent person can ignore that our purpose and challenge in life is learning how we, as imperfect humans, may successfully relate to a Perfect Singularity-Creatorwithout our co-mingling, which transcends the timespace of this dimensional physical universe, becoming an imperfection to the Perfect Singularity-Creator
An orderly Creator necessarily had an Intelligent Purpose in creating this universe and us within it and, being Just and Orderly, necessarily placed an explanation, a "Life's Instruction Manual," within the reach of His subjects—humankind.

It defies the orderliness (logic / mathematics) of both the universe and Perfection of its Creator to assert that humanity was (contrary to His Tor•âh′ , see below) without any means of rapproachment until millennia after the first couple in recorded history as well as millennia after Abraham, Moses and the prophets. Therefore, theCreator's "Life's Instruction Manual" has been available to man at least since the beginning of recorded history. The only enduring document of this kind is the Tor•âh′ —which, interestingly, translates to "Instruction" (not "law" as popularly alleged). [Source and more extensive reasoning: www.netzarim.co.il]

Religions that contradict with Torah cannot therefore describe a religion from the Creator.

Anders Branderud