I think that the "Great Thumb" is actually an honorific title for the animist Supreme God, according to this site: These prayers for peace were offered in Assisi, Italy on the Day of Prayer for World Peace during the U.N. International Year of Peace in 1986.
A NATIVE AFRICAN PRAYER FOR PEACE Almighty God, the Great Thumb we cannot evade to tie any knot, the Roaring Thunder that splits mighty trees, the all-seeing Lord on high who sees even the foot prints of an antelope on a rock mass here on Earth, you are the one who does not hesitate to respond to our call. You are the cornerstone of peace.
That's an interesting site; there don't actually seem to have been any prayers directed to a being who is not conceived of as eternal, supreme, omnipotent, etc. However, there are some "prayers" which don't seem to be prayers at all, e.g. the Buddhist one, the Baha'i one...
Oh, so that makes it OK. Not. Aw, c'mon, just when I was beginning to like you. ;-)