1 Corinthians 15:1-4 "Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; By which also ye are saved, if ye keep in memory what l preached unto you, unless ye have believed in vain. For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; And that he was buried, and that he rose again the third day according to the scriptures:" Ephesians 1:7 “In whom we have redemption through his blood, the forgiveness of sins, according to the riches of his grace;” Jesus did it all for us on Calvary, all we have to do is believe.
God intentionally made the Gospel so extremely simple, that no one will have an excuse for not being saved.