I believe the key to understand where the Lord ( & the prophets, apostles etc.) speak of condemnation of non believers like in John 3:16-21, John 3:36, John 5:22-30, Romans 3:19-26 etc.are stern warnings of the worst possible consequences of unbelief.
These consequences aren’t guaranteed to every individual who may not have known or understood properly the Lord Jesus Christ and the Gospel. I believe the ultimate meaning of this is said by the Lord towards His direct persecutors in John 15:24-25 etc. The Lord, I believe, is definitely not comparing such sinful unbelief to someone like a Japanese Shinto fisherman back in the ancient day or uninformed, confused etc. people to this day. Statements like Matthew 12:30-33 etc., I believe, apply here also. The parable of the Good Samaritan in Luke 10:25-37 is really interesting because the Lord is speaking of the great commandments ( which are the law & prophets really, see Matthew 7:12 in light of Matthew 7:1-12, Matthew 22:36-40 etc.) in relation to the humanity of a Samaritan (!). This all lines up with what St. Paul tells us about individuals within humanity vs overall humanity in Romans 2:6-16 etc ( I believe).
We have to be careful not to soft pedal warnings of condemnation either; these are real & serious. In Romans 3:19-26 St. Paul is speaking back on the issue of fallen humanity. A Christian has salvation by grace, through faith unto justification lived by faith in good works ( Ephesians 2:8-10 etc.). All a non Christian has is their works and a somber appearance at the judgement ( Revelation 20:11-15 etc.)although it seems clear some will be written in the book of life. We cannot judge ( Matthew 7:1-12) but we can pray for ourselves & our neighbor (1 Timothy 2:1-6 etc.).