These two articles explore the effects of mindfulness on the immune system:

Davidson, R., Kabat-Zinn, J., Schumacher, J,, Rosenkrantz, M., Muller, D., Santorelli, S., Urbanowski, F., et al. (2003). Alterations in brain and immune function produced by mindfulness meditation. Psychosomatic Medicine, 65, 564-570.

Black DS, Slavich GM. Mindfulness meditation and the immune system: a systematic review of randomized controlled trials. Ann N Y Acad Sci 2016; 1373: 13–24.

I hope this helps!

There are several journals whose contents you might want to explore in your search for answers. One is the Journal of Psychology of Religion and Spirituality, with a website at http://www.apa.org/pubs/journals/rel/

Also, the Journal for the Scientific Study of Religion, at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1468-5906

PsycInfo and Medline are good places to search.

Like Dr. Carvalho's reply, some of the type of explorations of Kabat-Zinn style mindfulness currently being undertaken vis-a-vis neuro-physiological and immunological studies have also been conducted with Transcendental Meditation. I see one example here:

Article Levels of immune cells in transcendental meditation practitioners

Being in good terms with God enhances wholeness of humans and as well immunity.

Great answer Dr. Emmanuel Ifeanyi Obeagu . I highly agree with you

Kindly go through this useful PDF attachment.