So on a day-to-day basis, how do three mentally ill Jesi exist in the same space and time? In the exact same way the rest of us do it -- for the most part, they dodged the issue. Whenever the topic of their divinity came up in conversation, the others hastily changed the subject. Coming face to face with a metaphysical paradox is something nobody has time for first thing in the morning. Although, on a couple of occasions, the conflict over who was the real Jesus of Nazareth could only be settled with fists.
Apparently the whole cheek-turning thing was bullshit.
Eventually, one of the patients seemed to change his mind, and rather than Jesus, he started demanding that people address him as "Dr. Dung." He never renounced the idea that he was the Son of God, but at least he found an equally crazy compromise.
After two years, Rokeach gave up on the experiment, deciding that it wasn't going anywhere, which reveals a lack of creativity on his part. At the very least, he could have introduced them to someone who thought he was the devil.