Alma 32:22 And now, behold, I say unto you, and I would that ye should remember, that God is merciful unto all who believe on his name; therefore he desireth, in the first place, that ye should believe, yea, even on his word.
That is the very first test of the Gospel: merely to believe; to be believing as a little child would be believing, on the word of God. When someone fails that first test, there is no helping them; they see you as an enemy, which is why they disbelieve you, and they accept nothing you say except they see a demonstration of it - proof ("beyond reasonable doubt;" "extraordinary evidence"), or, in other words, a sign - that they may know and not be required to believe, to trust, or to have faith, none of which alleviates their insecurity and disbelief; they require certainty and security of their enemies.
People do not voluntarily go to their enemies for help, but only under duress or coercion from a greater enemy or threat, and even then there is no trust - they are, after all, enemies, and fear is the rule between them - and there is inevitably a seeking of ways of screwing them over before one is oneself screwed over, or securing oneself from the inevitable screwing. So whatever they receive from their enemy is viewed with suspicion and doubt. Lack of evidence of malice is not evidence of lack of malice, after all - there could always be a hidden trap or poison or lie somewhere we're not looking, a hidden method of enslavement.
So you can't help the disbelieving - not in this internet context, anyways.
The first rule of a civil society is simply that the citizens be not hostile against their fellows. Disbelief is a sure sign of hostility (via the principle of psychological projection; see Romans 2:1 - the disbeliever believes the other is a liar). If then a man is hostile against his fellows, he will not voluntarily endure their society eternally. Think about it.