Humbly , for me the answer is because, love is sacraficial towards self and beneficial towards others, and that is what God's word teaches, and what Jesus Christ did on the cross as a living example,Jesus- God in the flesh, showing that the greatest thing one can do is give up their life for others, and this does not mean to seek martydom in a vain attempt to eagerly sacrafice ones life in exchange for death, more often giving up ones life means - putting others before ourselves, rejecting vainity, and embracing compassion, and love; and if called to do so, and not by forethought and conspiring for vain glory, but for love of another to save their life, and ultimately lay down your own; preventing harm, never causing it. Love is the answer, Jesus Christ is love - God is love.
That's why I believe; I see the truths,the noble, loving, underlying messages, despite any translation faults, or editing done by the church, I know God, His Holy Spirit ministers to me the ministry of Christ's love.
As an example, the beautiful prophetic writing of Isaiah, foretelling who Jesus Christ is, and the suffering that God would endure for the love of all people. Sacraficing His life, not His childrens! this alone should show you to what extent God will go for all of us! and to me, this shows God doesn't punish and eternally torture any of His creation or children, that's not God! I don't care what parts of the Bible say, I know God, I know what He did on the cross forever seals His unending steadfast love for all.
Also, all of us relate to Christ , we too suffer unduly and we strive for love, we bare our crosses, and through God I know we overcome them, as He overcame His! Why do I believe? because this is me, this is my experience, what I go through, and Christ went through the same and more having never committed wrong, God in the flesh suffering the onslaught of evil, overcoming the cross and death, establishing forever our relationship with God.
Isaiah 53 ►
1Who has believed what he has heard from us?
And to whom has the arm of the LORD been revealed?
2For he grew up before him like a young plant,
and like a root out of dry ground;
he had no form or majesty that we should look at him,
and no beauty that we should desire him.
3He was despised and rejected by men,
a man of sorrowsc and acquainted withd grief;
and as one from whom men hide their faces
he was despised, and we esteemed him not.
4Surely he has borne our griefs
and carried our sorrows;
yet we esteemed him stricken,
smitten by God, and afflicted.
5But he was pierced for our transgressions;
he was crushed for our iniquities;
upon him was the chastisement that brought us peace,
and with his wounds we are healed
ETA ( I feel that a song praising the Lord's love should follow, Isaiah) -