"For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish, but have eternal life." (John 3:16)
"For the wages of sin is death, but the gift of God is eternal life through Jesus Christ our Lord."
Eternal life is God's gift to the world, not to Christians. You've become a Christian only after you've received eternal life, which is the life and nature of God. What Jesus came to do, the salvation He brought, was for the whole world. So, in the mind of justice, the whole world has been saved because Jesus paid the price for every man's sin. This is legal salvation. Vital salvation is only received by personal faith in Jesus Christ.
Unless you acknowledge and accept His vicarious sacrifice, you won't experience the vital reality of the finished works of salvation in your personal life. As Christians, we have a responsibility to tell the world about what Jesus did. Many don't believe because they haven't heard.
"How then shall they call on Him in whom they have not believed? And how shall they believe in Him of whom they have not heard? And how shall they hear without a preacher?"
They've got to hear that Jesus is the way, the truth, and the life, and that He's made that life available to everyone. It's a gift; therefore, they don't have to work for it-- all they need is to receive it.
"if you confess with your mouth Jesus is Lord, and believe in your heart that God has raised Him from the dead, you will be saved, for with the heart one believes unto righteousness, and with the mouth confession is made unto salvation."
That's how simple it is to receive this glorious, wonderful gift of eternal, and become an associate of the God-kind.
The human life is depraved, degenerate, and broken; but God has provided another life, the transcendent life, which He wants all men to have and to live. It's the life of absolute victory, glory, righteousness, and dominion in Christ. This life makes you indestructible and supernatural, and it's only available in Christ.
I thank You, precious Father, for sending Jesus to die for me, making it possible for me to have eternal life. This life is working in every fiber of my being-- it repels sickness, disease, infirmity, death, poverty, and everything that's inconsistent with the provisions of the divine life, in Jesus' Name. Amen.
Further Study: Romans 6:23; 1 John 5:13