Welcome to the forum.I hope you benefit from your stay here. You have raised an interesting question though i would like to point towards an error which is present in the methodology you have adopted to address the first assertion you have made in your post. It is the epistemic of any rational person , especially for those who are looking for the truth , to be objective in their study of the stuff relevant to their research. Objectivity comes from looking into the agreed upon scripture which is with us through an undisputed and unbroken chain ie Quran. This book , so much revered by the Muslims , has a tall claim about itself that it is the book of the one and only Godand judging that claim also judges the truth-hood of Prophet Muhammad as he also made the same claim about that Quran. For example , if i had to adress the question "What form of democracy is there in America and which party is justified in its claim of upholding the true democratic values?" and i start with reading the manifestos of the Democrats and Republicans to answer my question , then obviously that will not be an objective analysis of the question. However , if i pick the American constitution and after absorbing the various pretension it makes about democracy and then i analyze the claims of the Democrats and Republicans , that will be a fair and rational approach from my side. There is a verse in Quran regarding which says Fa Alamaha Fajooraha wa Taqwaha " And (God) inspired it (with conscience of) what is wrong for it and (what is) right for it. The undesirable discrimination between right and wrong , truth and falsehood exists in our very nature as described by Quran. The issue of "basis for truth" is not a minor one as the presence of a life hereafter in which punishments for bad deeds shall be given , necessitates it for a true religion that it makes its case so evident to humans that if after that one rejects it , he makes himself justifiably liable for the punishment of hereafter which Islam calls Kuffr . The amount of ambiguity found in various religions which makes them unacceptable for human nature makes their claim of punishment in hereafter immoral and the falsification of the concept of hereafter falsifies the whole religion. Islam on the other hand provides a conclusive argument for its truth and the evidence matches so well with human nature that it testifies the truth of Islam.