Allah (SWT) guided all human beings to the right and warned them from wrong. (We showed him (human being) the two ways,; good and bad) (Sura 90, Verse 10).
(Verily, We showed him the way, (for him to decide) whether to be grateful or ungrateful) Sura 76, Verse 3).
Allah (SWT) helps every one who wants to be guided, as He kept the instinct knowledge in every human being about the main facts of the existence (Tawheed, Adl, Nubawwat, Imamat, and Qiyamat) and helps those who want to strive to be guided (Those who strive in Our way, We will verily guide the to Our ways ) (Sura 29, Verse 21). But those who refuse the guidance of Allah (SWT) and insist on refusing it, will be let alone with their own option.
Allah (SWT) is gracious to all His creatures and He showers His Mercy on all of them : My Mercy included every thing .(Sura 7, Verse 156).
Guidance from Allah is always offered to every one who wants it, but it can not be enforced on those who insisting on refusing it.