Here is why Universalism is not Biblically supported:
Matthew 26:24 "The Son of Man goes, as it is written of Him, but woe to that man through whom the Son of Man is betrayed. It would be good for that man if he had not been born."
"But as for the cowardly, the faithless, the polluted, as for murderers, fornicators, sorcerers, idolaters, and all liars, their lot shall be in the lake that burns with fire and sulphur, which is the second death." (Rev. 21:8)
Sincerely,
Ken