Was Jesus crucified on a cross or hung on a tree?
With malice towards one & all
The church tells us that Jesus was crucified on a cross and died. The Bible is the only source of evidence, but these scriptures are inconclusive about the basic facts in question. The cross is symbolically associated with Jesus Christ, but while the Bible clearly states in places that Jesus was hung on a tree, there is no clear statement that Jesus was crucified on a cross. References the crucifixion tends to allude to these facts rather than simply stating directly that Jesus died by crucifixion on a cross, and statements about the cross and the crucifixion are ambiguous, elusive, mysterious, and possibly allegorical. For example, Peter told the Jewish authorities they had killed Christ "by hanging him on a tree" (Acts 5:30). Peter was denouncing them for wrongly having subjected Jesus to a humiliating death. But, said Peter, God had glorified Jesus by raising him from the dead (verse 31). Peter did not mean to say the Jews had actually carried out a crucifixion. When Pilate suggested that the Jewish religious leaders judge Jesus, they said, "We have no right to execute anyone" (John 18:31).

"And we are witnesses of all things which he [Jesus] did both in the land of the Jews, and in Jerusalem; whom they slew and hanged on a tree" (Acts 10.39.)
"And when they had fulfilled all that was written of him, they took him down from the tree, and laid him in a sepulcher." (Acts 13.29.)
"Who his own self bare our sins in his own body on the tree, that we, being dead to sins, should live unto righteousness" (Peter 2.24.)
If Jesus was hung on a tree, perhaps the cross entered Christian symbolism because it has been an important religious symbol since long before the Christian era and before Jesus was crucified. "Whosoever will come after me, let him deny himself, and take up his cross, and follow me." (Jesus speaking long before he was crucified,
according to Mark 8.34.)
"For many walk, of whom I have told you often, and now tell you even weeping, that they are the enemies of the cross of Christ" (Philippians 3.18.)
And he said to them all, “If any man will come after me, let him deny himself, and take up his cross daily, and follow me." (Luke 9.23.)
If Jesus was hung on a tree, what is meant by the following verse?
"...for it is written, Cursed is every one that hangeth on a tree" (Galatians 3:13.)