There are existentialist therapies that do embrace the spiritual aspects of human beings and some who view human beings and human interaction as sacred so I can't really agree with the blanket assumption that psychology is secular. Psychologists in research spend time looking into altered states and transcendence and have since the beginning with William James. There is a lot of overlap in alternative therapy with spirituality and even distinct religious traditions and practices. Mindfulness has been incorporated into the most "scientific" form of therapy, CBT. And there is even an overlap now with neuroscience and contemplative practices so I don't think it is correct to assume that all of psychology is completely secular.