From my experiences, retreats and parish groups are where the worst of the modern, new age, secular spirituality meets the worst misunderstanding of ācatholicā as āall-inclusive.ā
This is due primarily to a lack of oversight, incidental or intentional, by those whose job it normally is to oversee the faith development of their flock.
If you see that there is a problem, please contact your priest. If you feel your priest is the problem, contact your bishop.