As I wrote on my bio page at Smashwords / Draft2Digital my books are like rough drafts whereas the descriptions of my 39 You Tube playlists are the finished goods. There is lots of important info in my main book - "Constitutional History of the Western World" - lots of info that is not covered in my 39 playlists.  But these 39 playlist descriptions are the best places to start.

https://youtube.com/@billetem5868?si=dgCw4BW27fJEmpfv

You start off with 2 Options...

1 - Christianity is a SCAM.

2 - Christianity is NOT A SCAM.

Those of us who are Christians say Option 2 is true.

We Christians say Christianity is the True Faith which leads people to Heaven.

IF CHRISTIANITY IS TRUE...THEN...

Christianity is correct in saying Jesus is God, the Divine Son, see Psalm 2, Isaiah 9. 6, Matthew 1. 23, John 1. 1-14, Romans 9. 5, Colossians 2. 8-10, 1 Timothy 3. 16...

IF CHRISTIANITY IS TRUE, AS WE CHRISTIANS INSIST...THEN...

To be a competent teacher of Christianity you must be able to tell people, with perfect accuracy, how one identifies God's True Church which leads people to Heaven. 

A PERSON IS NOT A COMPETENT TEACHER OF CHRISTIANITY if he tells people that a specific church / a specific denomination will lead them to Heaven, when in fact that church is a FALSE CHURCH, a SCAM CHURCH lost in heresy which will drag them down to eternal perdition.

John 14. 23-26 and Matthew 16.13-19 tell us, in so many words, that it is heresy, it is a satanic lie, to say there is no True Church, or to say there are multiple True Churches. St. Paul's phrase "there is one body" in Ephesians 4. 4 means there is one True Church. The scriptural phrase "the Bride of Christ" means there is one Bride, i.e., one True Church.

But Christians have divided and subdivided Christianity into thousands of separate denominations / thousands of separate churches.

2 Thess 2 says the Antichrist shows up prior to the Second Coming of Christ.

Revelation 14. 6-11 says 3 angels from Heaven will show up.

Suppose an angel shows up. Suppose this angel says the Roman Catholic Church and only the Roman Catholic Church is God's True Church which leads people to Heaven. 

Suppose that angel says that every other Christian denomination, and every Non-Christian religion, leads people to eternal perdition.

So, if that angel is speaking the truth then he must be an angel from Heaven, assuming he never slips into heresy.

But if that angel is telling an evil lie, if in fact the Roman Catholic Church is a false church lost in heresy which drags people down to eternal perdition, then that angel is leading people to perdition, so he must be an angel from Hell, provided he never repents.

So, unless you know with 100% accuracy how to identify God's True Church, you might not be able to determine, should an angel show up, if that angel is an angel from Hell or if he is an angel from Heaven.