Thank you for mentioning the context of John 3:16, “Should John 3:19 be mentioned as well alongside John 3:16?”
You are absolutely correct that the context of John 3:16 should also be mentioned that those who reject God’s grace condemns themselves for that person refuses God’s exit of condemnation.
John 3 says this: 16 For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life. 17 For God did not send his Son into the world to condemn the world, but to save the world through him. 18 Whoever believes in him is not condemned, but whoever does not believe stands condemned already because they have not believed in the name of God’s one and only Son. 19 This is the verdict: Light has come into the world, but people loved darkness instead of light because their deeds were evil. 20 Everyone who does evil hates the light, and will not come into the light for fear that their deeds will be exposed. 21 But whoever lives by the truth comes into the light, so that it may be seen plainly that what they have done has been done in the sight of God” (NIV).
It is not that will or may be condemned but everyone is already been judged and condemned for their evil deeds. The question then becomes will they accept God’s pardon of forgiveness through Jesus Christ.
Christians are reluctant to state that listeners are not only sinners but have a death sentence waits them. There is an over emphasis of the love of God without sharing the holiness and righteousness of God.
Thank you for the reminder.