There will be a time when everyone “sees" the Son and believes in Him.
“For this reason also, God highly exalted Him, and bestowed on Him the name which is above every name, so that at the name of Jesus EVERY KNEE WILL BOW, of those who are in heaven and on earth and under the earth, and EVERY TONGUE WILL CONFESS that Jesus Christ is Lord, to the glory of God the Father.” (Philippians 2:9-11)
There is coming a time when everyone will bow and acclaim Jesus is Lord.
“In all wisdom and insight He made known to us the mystery of His will, according to His kind intention which He purposed in Him…the summing up of all things in Christ, things in the heavens and things on the earth.” (Ephesians 1:8-10)
It is my view that on that future last day God will have “summed up all things in Christ”. All humanity will be saved, justified, reconciled and glorified. God the Father will be All in all.
“As in Adam ALL die, even so in Christ shall ALL be made alive…that God may be All in all.” (1 Corinthians 15:22-28)
This is the gospel of God for humanity as I understand it - the Good News. It will happen whether humanity believes it now or not….THEY WILL then!