Is it true that Saul of Tarsus wrote 14 chapters of the Christian Bible?

Saint Luke wrote the Acts of the Apostles. Saint Paul wrote the majority of the epistles attributed to him. I'm not going to bother with counting them.

No.  Maybe books, but not chapters. 

Paul has been traditionally regarded as the author of 14 books, not chapters, of the NT.  The experts now almost unanimously agree that he didn't write Hebrews.  Some of the other books traditionally ascribed to Paul are of dubious authorship.

Saul/Paul (assuming he existed) had more control over the message that ended up in the bible than anything 'Jesus' supposedly said.

The Bible was inspired by God Who worked through his people to give us the Bible.  Bibles properly should contain 73 books, as do Catholic Bibles.  The seven Old Testament books Martin Luther removed from the Bible rightfully belong to its contents.

Technically, Saul of Tarsus wrote nothing in the Bible. He was converted to faith in the resurrected Jesus Christ on his way to persecute Christians in Damascus - by a vision of Christ and being instructed by Christ. When a Christian healed him of the blindness he suffered on the Damascus road, he was then instructed in faith in Christ, spent a lot of time learning, and some years later when his name had been changed to Paul, and he'd become an apostle of Christ, began to write. The apostle Paul wrote more than half of the New Testament part of the Bible, many letters addressed to specific Christian congregations.

Since the Reformation, it has been widely accepted that the letter addressed to Hebrew Christians could not have been written by Paul. There is no disharmony between the teaching in that letter called 'Hebrews' and all Paul's other writings but the specific emphases and writing styles are markedly different. As Muslims use the word 'surah' for whole sections of the Qur'an, I gather that by 14 chapters, you mean 14 surahs. Technically, Paul wrote about that many letters (which may be called Bible books).

Seven of the 13 letters that bear Paul's name are believed to be authentic.  The other 6 are forgeries.

https://en.wikipedia.org/wiki/Paul_the_Apostle#Aut...

Paul didn't just write 14 chapters, he wrote 14 books of the Bible.

He wrote Romans

Colossians 

1 and 2nd  Corinthians

Galatians

Philippians

Ephesians

1 and 2nd Thessalonians 

1 and 2nd Timothy

Titus

Philemon  and Hebrews

Some people on YA do not accept Paul's writing these books, but this is what Jesus said:  Jesus Christ declared that God’s Word is truth. John 17:17 

So this statement by Jesus says what Paul wrote is true.

Saul of Tarsus became Paul when he converted to Christ on the Road to Damascus.  Paul wrote nearly two-thirds of the New Testament.  Paul wrote, the book of Romans, 1 & 2 Corinthians, Galatians, Ephesians, Philippians, Colossians, 1 & 2 Thessalonians, 1 & 2 Timothy, Titus, Philemon and Hebrews

Saul of Tarsus, also known as the apostle Paul, is credited with writing 13 books of the Christian Bible. The separate pieces of the Christian Bible are called "books," and the books contains multiple short chapters. 

So my answer is yes, but actually he wrote much more than 14 short chapters. 

Edit: the Bible book named Hebrews was written anonymously. Some people count that as another possible book written by Paul. That is why you will see the difference between 13 and 14 in the replies you get.