Heb 11:4, Jn 14:6, Acts 4:12
In the Old Testament, Cain offered grain as a sacrifice to God. But God did not accept Cain's sacrifice. On the other hand, Abel offered a sacrifice to God as the firstborn of a sheep, and God accepted Abel's sacrifice. (Genesis 4:4)
Genesis 4:4 And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the Lord had respect unto Abel and to his offering:
Abel's firstborn signifies the coming Christ. Christ alone is the true sacrifice. (Heb 11:4)
Heb 11:4 By faith Abel offered unto God a more excellent sacrifice than Cain, by which he obtained witness that he was righteous, God testifying of his gifts: and by it he being dead yet speaketh.
Jesus is the only way to meet God and the way to salvation. (John 14:6, Acts 4:12)
John 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
Acts 4:12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.