That is an insanely high suicide rate, I am so sorry that this is happening at your church. I really hope that things get better soon. All you can really do though is try to be kind and supportive to those you come in contact with there. Let them know that you care about them and that you're there for them if they need you, sometimes that can really help a person who feels isolated and hopeless. You can't blame yourself for these things, but it is good that you're trying to be part of the solution.