Some confusion comes from the CATHOLIC bible having more books than the original King James (66).
When you mentioned the gospel of Thomas, I realized that the confusion starts with the extra books in the Catholic bible. This is a list of the 66 books that have been accepted in born again Christianity (I found this in my library and don't know who wrote it, but, everything is doctrinal).
Satan doesn't just provide confusion in our thought processes, but in what we read also.
F.Y.I.,...the Jehovah's Witness bible actually has verses missing (satan's tricks flourish among human nature).
The Old Testament is how God was worshipped BEFORE Jesus came to earth, the NEW testament is how we are to worship now that Jesus Christ has become the one and ONLY (final) sacrifice for sin. God was worshipped in the OLD testament [times] by simply following rules (religion), but, in NEW testament times (after Jesus died on the cross), we worship not only in gatherings, but in our daily lives with our personal relationship to Jesus, and with the gifts of the Holy Spirit in service to Jesus.
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In GENESIS, the world was made;
In EXODUS, the march is told;
LEVITICUS contains the law;
In NUMBERS are the tribes enrolled.
In DEUTORONOMY again, we're urged to keep God's law alone;
and these five Books of Moses make the oldest holy writing known.
Brave JOSHUA to Cannan leads;
In JUDGES often the Jews rebel;
We read of David's name in RUTH and FIRST and SECOND SAMUEL;
In FIRST and SECOND KINGS we read
how bad the Hebrew state became;
In FIRST and SECOND CHRONICLES,
another history of the same.
In EZRA, captive Jews return;
and NEHIMIAH builds the wall;
Queen ESTHER saves her race from death,
these books "Historical" we call.
In JOB we read of patient faith;
In PSALMS are David's songs of praise;
The PROVERBS are to make is wise;
ECCLESIASTES next portrays.
How fleeting earthly pleasures are;
the SONG OF SOLOMON is all about
love, like Christs; and these five books "Devotional" we call.
ISIAIH tells of Christ to come;
while JEREMIAH tells of woe,
and in his LAMENTATIONS mourns
the Holy City's overthrow.
EZEKIEL speaks of mysteries;
and DANIEL foretells kings of old;
HOSEA over Israel grieves;
In JOEL, blessings are foretold.
In AMOS, too, are Israel's woes;
and OBADIAH is sent to warn;
while JONAH shows that Christ should die;
and MICAH where He should be born.
In NAHUM, Nineveh is seen;
HABAKKUK tells of Chaldea's guilt;
In ZEPHANIAH are Judah's sins;
In HAGGAI the Temple's built.
Then ZECHARIAH speaks of Christ;
and MALACHI of John His sign;
the Prophets number seventeen,
and all the books (of the Old Testament) are thirty nine.
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NEW TESTAMENT (Hebrews 9:15)
MATTHEW, MARK, LUKE and JOHN
tell what Christ did in every place;
The ACTS tell what The Apostles did,
and ROMANS how we're saved by grace.
CORINTHIANS instruct the church;
GALATIANS show us faith alone;
EPHESIANS true love,
and in PHILLIPIANS, God's grace is shown.
COLOSSIANS tells us more of Christ;
and THESSALONIANS of the end;
in TIMOTHY and TITUS both,
are rules for pastors to attend.
PHILEMON, Christian friendship shows;
then HEBREWS clearly tells how all
the Jewish law prefigured Christ;
And these Epistles are by Paul.
JAMES shows how faith by works must live,
and (1&2)PETER urges steadfastness;
while (1,2&3)JOHN exhorts to Christian love;
for those who have it, God will bless.
JUDE shows tyhe end of evil men;
and REVELATION tells of heaven;
this ends the whole new testament
and all the books (new testament)
are twenty seven.
Author unknown