Does the Bible teach universal salvation?
“For God so loved the world, that he gave his only begotten Son, that WHOSOEVER BELIEVETH in him should not perish, but have everlasting life.” John 3:16
A voluntary living belief in Jesus is what will determine salvation.
“For as in Adam ALL die, even so in Christ shall ALL be made alive.” 1 Corinthians 15:22
All those who rebel are described as being thrown into the lake of fire and brimstone, symbols for a permanent and irreversible judgment of death—of permanent non-existence.
God loved the world so much he was willing to sacrifice His beloved Son for ALL who die in Adam. He created an opportunity for a heavenly class, the spiritual seed of Abraham, which will bless all the families of the earth through the resurrection of judgment and the Highway of Holiness (Genesis 12:2-3, Galatians 27-29).