I suspect that Gregor Mendel was creating his own project, not working on something the church asked him to do. Granted, providing room, board and a place to work is helpful, but how many good results were an actual part of church planning. I will read your link.
http://en.wikipedia.org/wiki/List_of_Roman_Catholic_cleric%E2%80%93scientists
http://www.catholic.com/magazine/articles/fathers-of-science