If you were to write a book that explained every aspect of God, salvation, and spiritual things down to the nth detail.... and if that book proved with indisputable scientific, legal, and logical facts concerning these things of which we speak.... and if you were to distribute this book into the hands of every person on the planet... and if every person on the planet were to read it and become fully convinced on a mental and logical level regarding these truths....:
That alone would not save a single person.
Because people are saved by faith, and faith comes by hearing Christ speak truth into the heart. The natural man (that is the man on the outside, or the soulish/mental man) does not receive the things of God so as to effect salvation in him. In fact the natural man cannot even perceive them. They defy rationalization and in fact cannot even be described by the tools of language and reason that are utilized by the natural man.
After all our efforts to make the gospel and spiritual truth palatable to modern man, he is still going to have to receive it as a child... that is: one who is barren of the logical and mental support structures with which we attempt to prop up and for which we desire to make the truth digestible to our mental man.