What is the most printed book of all time and in your opinion why?

Without a doubt it's the Bible. God's life manual to His people.

Agree with the content or not, but The Bible is the most printed book in history by a long margin.

Euclid's Geometry book written something like 2500 bc and never out of circulation or print, easily the most non fiction historically, and the bible the most widely published and translated ever are generally considered the top two books.

The bible.. A great story and a best seller for about 800-1000 years.it is printed in every language and every hotel has one in the bed stand.

Jehovah wrote and inspired men to write history and to writes his thought, prophecies, and fulfilment.

Exodus 3:14

So God said to Moses: “I Will Become What I Choose to Become.” And he added: “This is what you are to say (Acts 10:35;Matt.24:14;PS.37:9-11,29;Matt.6:9-11), ‘I Will Become has sent me to you.’”

Isaiah 43:11-13

11 I—I am Jehovah,+ and besides me there is no savior.”+

12 “I am the One who declared and saved and made known

When there was no foreign god among you.+

So you are my witnesses,” declares Jehovah, “and I am God.+

13 Also, I am always the same One;+

And no one can snatch anything out of my hand.+

When I act, who can prevent it?”+

I would assume its the Bible, in all its variations, simply because it's been around for so long and such a huge amount of people are religious.

The Bible. Greatest story ever written.

The Bible of course DA! I don't read it just had to add that

The Bible

The Bible. Propagation of the faith.