
This question falls under the Fair Use provision of our copyright law, 17 USC 107. Under "fair use", a copyrighted work may be reproduced for criticism, comment, news reporting, teaching, scholarship, or research without infringing. It seems possible the project you describe can be considered teaching. Other factors that are considered include, whether the use is for commercial purposes or nonprofit educational purposes, and the portion or amount of the work being reproduced. Both of these factors seem very favorable to the facts you recite. An informed opinion on fair use will take all of these factors and others into consideration.
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Philip Braginsky, Sills Cummis and Gross
http://www.sillscummis.com/practice/practice_group.asp?id=28
Other Answers
It depends. Publicly displaying and performing someone else's copyrighted works is infringement unless your use is a "fair use." In this sense, "public" means the work is performed in a "place open to the public or at a place where a substantial number of persons outside of a normal circle of a family and its social acquaintances are gathered." A church gathering as you describe would almost certainly be a "public" place. Fair use of a copyrighted work depends on a number of factors, which include (1) the purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes; (2) the nature of the copyrighted work; (3) the amount and substantiality of the portion used in relation to the copyrighted work as a whole; and (4) the effect of the use upon the potential market for or value of the copyrighted work. There is no bright line rule for whether a use is a "fair use." You also should be aware that if you are using the likenesses of famous people, you also could be infringing their right to privacy and the use of their image to promote your church.