Was so that Humanity are Redeemed from Slavery of Sin, Lost Souls can be Saved from Earthly sin. But only if one of honest and true heart Repents in Christ’s Name.
Jesus Bodily Flesh died on the Roman Church's Cross. Where Christ's Spirit rose to the 1st Dimension of as of 1 in God's Trinity in Eternal Heaven. Then descended creating Jesus' Resurrected Kingdom in the 2nd Verse. Only to redeem Humanity from Slavery of Idol worship and sin.
So with Jesus' showing .us the "Way" back up into 1D=Eternal "Truth" and Ever-Lasting "Life"; To paraphrase John 14:6. Where in 1D is an active alive state of Only Ever Always Vibrating Holographically as 1. Within 1D=God's Holy Trinity in Eternal Heaven!
Wherein Mark 1:15, it says “The time is fulfilled, and the kingdom of God is at hand;[a] repent and believe in the gospel.” But only if one repents of sin, true of heart in Jesus Christ's most blessed name. After acknowledging one's Sins. Confessing them to God; alone or with others for support in staying on the straight and narrow. Whereas Jesus stated in Luke 3:5 "and the crooked shall become straight..."
Where then one's Soul may “Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. 14 But small is the gate and narrow the road that leads to life, and only a few find it. As Spoken by Jesus our Only Messiah and Savior as written in Matthew 7:13-14.
As is Inspired by God and transcribed in Jesus' New Testament, per Christ's New Covenant of our Holy Bible.