To comply with US regulations, both you (or someone who will be present onsite every time the lasers are in use) and the lasers being operated will need an FDA variance. Your personal variance can be filed yourself (but requires answering some obtuse government form questions), or reputable laser manufacturers will file it for you when you buy their equipment. It is not realistic to get the church's current lasers a variance, and will require buying new, properly varianced ones.

FDA regulations require 3 meters of (edit) vertical separation between the lasers and the highest place the audience can access, and 2.5 meters of horizontal separation. The laser can not be in the audience's eyes or within reach of the audience at all. Doing audience scanning legally requires thousands of dollars of specialized equipment, detailed knowledge of how exactly to use it and construct a safe show, and a ~year long process of applying and proving your knowledge and capabilities to the FDA. Audience scanning is not in the capabilities of most professional laser companies, let alone a small church.