The former London taxi driver, who was convicted in 2009 of 19 offences including rape, is also said to be reading his Bible every day.
A prison source told the Daily Star: "Worboys is seriously misguided and I believe is potentially still a danger to women.
"He thinks he is born again since embracing religion and that he has been forgiven.
"He says he is a changed man - but how can this be proved?"
According to the newspaper, the 60-year-old became a believer after attending Church of England services at the maximum security Wakefield prison in West Yorkshire.
The source went on to say: "A cynical person might think he's done this as the best way of getting parole.
"He then shows remorse, admits his guilt and fulfils the requirements of the Parole Board."
Worboys could be free within weeks after a three-person panel at the Parole Board approved his release, concluding he no longer posed a risk to the public.
On Sunday, it emerged a review by the Justice Secretary David Lidington will investigate how the Parole Board for England and Wales makes its decisions, following shock among some of Worboys' victims at news he will be released so soon.