This is very serious. People need to lose their jobs over this and possibly be charged with Child Endangerment. When I taught I would never have done anything like this. If I did do a trip to a religious institution I would have been extremely careful to insist that the people at the institution being visited were clear on the rules to ensure that no proselytizing was directed at the students. At one time I did draw up a list of religious institutions that students could visit and then write a paper on with guiding questions on what the architecture was and how it related to theological concepts that we had discussed in class. That was when we were studying the Reformation and the physical setting of services related to changing perceptions of the roles of clergy and laity with impact on the evolving concepts of sacred and secular authority and the rise of Democracy in Western Civilization. Even at a school for the Talented and Gifted that was a pretty sophisticated subject and had to be approached carefully and offered for outside study with parental participation, after informing the Department Head.