I want to prod ColdSteel a bit to respond (hopefully).
The truth is that if God emblazoned incontrovertible evidence across the heavens, many would still reject Him.
This is interesting, it's also not what Mormonism teaches:
Mosiah 27:31 Yea, a every knee shall bow, and every tongue confess before him. Yea, even at the last day, when all men shall stand to be b judged of him, then shall they confess that he is c God ; then shall they confess, who live d without God in the world, that the judgment of an everlasting punishment is just upon them; and they shall quake, and tremble, and shrink beneath the glance of his e all-searching eye.
The actual reason taught in LDS dogma is that Faith is the first principle of the Gospel:
4th Article Faith - We believe that the first principles and a ordinances of the Gospel are: first, b Faith in the Lord Jesus Christ; second, c Repentance ; third, d Baptism by e immersion for the f remission of sins; fourth, Laying on of g hands for the h gift of the Holy Ghost.
And that the reason why faith is required is:
Ether 12:6 And now, I, Moroni, would speak somewhat concerning these things; I would show unto the world that a faith is things which are b hoped for and c not seen; wherefore, dispute not because ye see not, for ye receive no d witness until after the e trial of your faith.
Therefore this earthly life is a trial, to see who and what we are without accurate knowledge, in short we are required, according to LDS dogma, to live by faith without knowledge as a test and trial which, if we pass then gives accurate knowledge.
Alma 42:10 Therefore, as they had become a carnal , sensual, and devilish, by b nature , this c probationary state became a state for them to prepare; it became a preparatory state.
So returning to the quote above , it's nothing to do with those who would reject God (I suspect that there would be almost 100% acceptance of the existence of a god who gave 'incontrovertable evidence' much as there is 100% acceptance of the existence of the sun ) but more to do with invalidating this earthly test (i.e. God wandering onto the stage during the exam gives all the pupils the cheat sheet answers.)
Therefore, LDS acceptance of faith as the first principle of the gospel is in direct and violent contradiction with the scientific method. LDS faith makes the lack of information the test condition and the human , subjective response the outcome. Science is unconcerned with such self-important and utterly delusional fluff and simply seeks to explain all observed phenomenon. The LDS god would be ruining the test if he ever gave any real answers that were useful for mankind.