Jesus did not die on a crux (cross), but on a stauros (stake).
X was used first as it is the first Greek letter of the word Christ. The custom of kissing the cross by Roman Catholics is where signing your letters with XXX for kisses originated.
X with a P (Chi Rho) superimposed on it, is what Constantine saw in a vision. X with l stake through it was also used as a symbol...plus the one (lung cancer symbol) t with an extra - at top. They are all brands of different pagan gods such as the Egyptian healing god Aesculpius and others. t or tau is for Tammuz.
Christian references commonly state Jesus was killed on a stake or single pale or pole.
There are many Hebrew and Greek references and interlinears available
to preachers and seminary students and often to ordinary lay people as
well....especially on the internet where they can be used free of charge.
Hard copy (books) may cost dozens or hundreds of your dollars.
The origins of cross and trinity are commonly known to preachers. You
can view these materials for yourself. I'll provide links: This may take
2 of these messages as they can only be so long.
Cross References
Strong's Greek Dictionary/Vine's Expository Dictionary of NT words
James Strong did Strongs concordance also.
http://www.apostolic-churches.net/bible/strongs.html Use this to check
any verse in KJV where "cross" occurs. Hit the word link to find what
instrument was actually used to kill Jesus.
http://www.tgm.org/bible.htm This link has both Strong's and Vines'
actual original language word dictionaries. Scroll down to either and
put cross in the English or Stauros in the Greek box. Strong's number
is 4716.
http://cf.blueletterbible.org/lang/lexicon/lexicon.cfm?Strongs=G4716&t=KJV
Thayer's Greek lexicon
http://www.studylight.org/isb/ Interlinear Bibles showing English and
Greek. Click on the word to see what it really means/comes from.
This has the Textus Receptus that KJV used, Byzantine, and Nestle-
Arnand Greek texts and several Hebrew Interlinears also.
http://philologos.org/__eb-ttb/ The Two Babylons book by
Reverend Alexander Hyslop, 1800s....has a cross section.
http://www.nazarene-friends.org/nazcomm/40/010.htm#38
21st Century Bible (Nazarene) has lengthy notes on cross not
being the instrument used each place where cross occurs in Bible
(footnotes..click link)
http://www.wordofyah.org/scriptures/nt/B40C010.htm
Paleo Times Bible (historic and linguistic, uses stake instead
of cross in English Bible text)
Vine's Expository Dictionary of New Testament Words
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Cross, Crucify
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Cross-references:
Also found in Nave's Topical Bible
Also found in Easton's Bible Dictionary
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Cross, Crucify
A. Noun
stauros
B. Verbs
stauroo
sustauroo
anastauroo
prospegnumi
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A1. Cross, Crucify [Noun]
stauros denotes, primarily, "an upright pale or stake." On such malefactors were nailed for execution. Both the noun and the verb stauroo, "to fasten to a stake or pale," are originally to be distinguished from the ecclesiastical form of a two beamed "cross." The shape of the latter 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 3rd cent. 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 apart from regeneration by faith, 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.