We humans are on solid ground talking about faith but getting into the “damnation” thing is folly because it attempts to limit God. In the past six months two of my former colleagues died - true story. One was an avowed atheist; the other an overt church going born again Christian. In practice their lives were identical. They were both teachers; both kind and gentle; both reached out to students; rescued animals; visited people in the hospital; gave their time and money to strangers who needed help. The notion that one is in heaven and the other in hell is absurd!
The idea is not absurd. If one assumes there is an eternal life past death and that it is predicated on the Christian faith (ie. Jesus Christ came to the world to forgive those who believed in Him and give them eternal life in Heaven) then it makes sense why two people who act in the same moral, ethical, and essentially kind way would end up in two different places.
Living a life of evil does not send a person to Hell, instead it is merely transgressing against God one time that does—something literally everybody has done whether it be lying, cheating, coveting or taking the Lord’s name in vain. Because of this disobedience all people will go to Hell when they die. You may reply with the “infinite punishment for finite transgression” is absurd, but this assumes the premise Hell was created for this purpose. It is not. It was created to punish Satan and his followers for trying to become more powerful than God. They deserved infinite punishment for such a horrible and direct transgression against God. It just so happens that we as humans are “caught in the crossfire” of this arrangement. When the first sin occurred, it was mandatory that disobedience to God be punished with Hell.
You know the rest of the story of Christ I’m sure, but in the end, only one of these two people sought God to make things right again. Only one of these two people sought God’s forgiveness and only that person will enter into Heaven.
If your actions alone sent you to your eternal fate then life would be absolutely horrendous since every person in the entire world would be damned to Hell for all eternity.