Final answer:
In 'The Crucible', John Proctor's youngest son has not been baptized because Proctor questions the motives and practices of the church.
Step-by-step explanation:
In the play 'The Crucible' by Arthur Miller, John Proctor's youngest son has not been baptized because Proctor is not a fervent believer in organized religion. He questions the motives and practices of the church, including the baptism ceremony. Proctor believes that personal faith and moral integrity are more important than ritualistic practices.