Definitely go for it. Do it because it's on your heart to cut it for free, not to get something back out of it financially. I cut our church for free as well as do clean ups, etc. It takes 3 guys about 2 hrs to cut. I honestly enjoyed it as a "wind down time" and still kind of do. I do get a letter of donated services for taxes but thats not why I do it. To the best of my knowledge, much of the congregation doesn't know I maintain the grounds. I have been blessed with the equipment and knowledge to take care of the property better and faster than others. I look at it as it frees up a lot of money for the church and if everyone uses talents given to them the focus can be put on the true purpose of the church. Hope it goes well for you!