Theists..especially ' born agains ' who claim to have had a personal and sometimes physical manifestation of christ or his presence imo are coming from a psychotic state of mind.
This brings into perspective the workings of the human brain and the reasons why it can so easily be duped.
The fact that o.p. poses such a question is a symptom of this condition.
I for one hope that the quicker they return to reality they will enjoy a better fulfilled life.
Many of us are testament to this.