Based on scriptural evidence alone (the only important type of evidence) we can say without hesitation that Jesus died on a stake/tree.
The Greek word generally translated “cross” is stau·ros′. It basically means “an upright pale or stake.” The Companion Bible points out: “Stau·ros′ never means two pieces of timber placed across one another at any angle . . . There is nothing in the Greek of the New Testament even to imply two pieces of timber.”
In several texts, Bible writers use another word for the instrument of Jesus’ death. It is the Greek word xy′lon. This word simply means “timber” or “a stick, club, or tree.” (Acts 5:30; 10:39; 13:29; Galatians 3:13; 1 Peter 2:24)
The most convincing proof of all, however, comes from God’s Word. The apostle Paul says:
(Galatians 3:13) “…Christ by purchase released us from the curse of the Law by becoming a curse instead of us, because it is written: ‘Accursed is every man hanged upon a stake [“a tree,” King James Version]…’”
Here Paul quotes Deuteronomy 21:22, 23, which clearly refers to a stake, not a cross.
There is no evidence that for the first 300 years after Christ’s death, those claiming to be Christians used the cross in worship. In the fourth century, however, pagan Emperor Constantine became a convert to apostate Christianity and promoted the cross as its symbol. Whatever Constantine’s motives, the cross had nothing to do with Jesus Christ. The cross is, in fact, pagan in origin. The New Catholic Encyclopedia admits: “The cross is found in both pre-Christian and non-Christian cultures.” Various other authorities have linked the cross with nature worship and pagan sex rites.
Why, then, was this pagan symbol promoted?
Apparently, to make it easier for pagans to accept “Christianity.” So everywhere you see the word cross written in your Bible, just know it was placed in there as a pagan tradition of man , it does not belong there. At the end of all things however the important thing is Jesus life paid for our sins, what he died on isn't important, however the promotion of idolatry because of the cross falsehood is obviously a snare set by the Devil to insult God.