Of Cursing?
The cross is a tree in the sense that our Lord Jesus took the sins of all believers upon His body and was left hanging on the tree, but Jesus came to fulfill the Law of us and in doing so He was taken down and buried as was what the Law required!
Good works does not save us, we have to believe that the blood of Jesus and His death and rising on the third days atones for our failings and also we have the promise a New Life in His rising from the dead?
Deuteronomy 21:23, Galatians 2:11-13, Hebrews 9:26-27, 10:38.