Here you go(the first of these is a crucifixion of an individual
before Jesus);
The first one dates back to the 3rd century
BCE.
This one is 2nd Century CE graffiti, depicting a woman(the picture does not show it, but there is a name above it, 'Alcimilla')
This one is one of the earliest depictions of the Nazarene's crucifixion from roughly the 1st-2nd Century(the words are mocking a Christian named Alexamenos)
And this here is a 2nd-3rd century CE talisman of sorts, depicting Jesus
Still sure it was a stake/spike?
Well, I Googled the images and found the ones you have shown but I also saw those with an upright stake, (above) so because the instrument on which Christ was impaled is called a "stauros" in the scriptures, (which never means a cross) I can be as sure as you are that what the Bible says is true.
The cross as a religious symbol was in use long before Jesus walked the earth......
Cross - Wikipedia, the free encyclopedia
Why does Christendom insist that Christ died on a cross?
According to
Vine’s Expository Dictionary of Old and New Testament Words, the shape of the cross “had its origin in ancient Chaldea, and was used as the symbol of the god Tammuz (being in the shape of the mystic Tau, the initial of his name) in that country and in adjacent lands, including Egypt.
“By the middle of the third century A.D. the churches had either departed from, or had travestied, certain doctrines of the Christian faith. In order to increase the prestige of the apostate ecclesiastical system, pagans were received into the churches…and were permitted largely to retain their pagan signs and symbols. Hence, the Tau or T, in its most frequent form, with the cross-piece lowered, was adopted to stand for the cross of Christ.”
Who was this Tammuz? Anciently, he has been known by many names: Baal, Molech, Osiris. The Bible identifies him as Nimrod: “He was a mighty hunter before [in place of] the Lord” (Gen. 10:9).
Tammuz was the dying god who came to life as a mimic of Jesus. Babylon is the origin of this symbol. Tammuz is the one honored by the cross.
The point, as I mentioned before is not just the shape of the implement used to put Christ to death....apart from its unsavory beginnings, it is the continued use of this image as an object of worship. The transfer from paganism to Christianity is plain to see. There is no "cross" in the Bible.
This image is reverenced and it is bizarre that people make replicas of this thing and decorate their places of worship with it and even wear it as jewellery.
If Jesus had been hung, would they have replicas of gallows on their churches or have them hanging around their necks? Perhaps some might have a little figure of Jesus hanging from the rope!
Or if Jesus had been shot with an arrow...beaten to death with a club....what then?
This is how JW's depict the death of Christ and there is nothing in the Bible that argues with it.