“ here). All Christians believe in the Second Coming of Jesus at the end of time, ”
So, in your own way, you are predicting when Jesus will return, and are you telling Him He can only return when you MOST expect Him?
Why trust the Vatican to interpret Revelation and 1&2 Thessalonians when it FAILED to heed Romans, Galatians and Hebrews?
Nope. I make no predictions at all because He didn't give us a date and He told us plainly, "No man knows that day and hour."
Why trust the Vatican to interpret Revelation and 1&2 Thessalonians
"The Vatican" has no official interpretation of Revelation or any other book of the Bible. What interpretations we do have have been passed down from the early Church Fathers who immediately followed the Apostles and wrote extensively on the Sacred Scriptures.
when it FAILED to heed Romans, Galatians and Hebrews
That is only your opinion based your fallible personal interpretation of the Bible.