A second reply in case all you needed was a teaching from the Catechism to change your Faith & accept the existence of Purgatory as taught by Holy Mother our Church.
The Catechism: III The Final Purification, or Purgatory
1030 All who die in God’s grace and friendship, but still imperfectly purified, are indeed assured of their eternal salvation; but after death they undergo purification, so as to achieve the holiness necessary to enter the joy of heaven.
1031 The Church gives the name Purgatory to this final purification of the elect, which is entirely different from the punishment of the damned....
It’s not possible to argue someone into Heaven. Faith comes from God & it is God that transforms the human-heart. The Gates of Heaven are open for ALL people that: ‘Love God above all things & love their neighbors as themselves.’ To deny God’s Grace has to be done wilfully & with full knowledge.
Jesus did this for me.
Because God loves me that much.
Welcome to the New Covenant.