Do JWs have Bible studies without using JW materials? Front door studies VS back door?

The point is we study THE BIBLE with people.

Their own Bible.

We try to get them to see what the Bible actually teaches.

They are often surprised that NONE of the primary doctrines they heard in their churches come from the Bible.

If we use our literature it is as a study guide.

We strongly encourage everyone to LOOK UP ALL THE SCRIPTURES.

Then they should do lots and lots of research on their own.

We WANT them to ask and ask questions and look up the answers themselves.

We want them to really learn HOW to study. Not many people know how to do that.

People need to prove to themselves that what the Bible really teaches is the truth. They need to use their minds to really THINK.

Yes, but most people who are willing to study do not mind using our literature as a reference. We use it as a reference because we do not know who might be at the door and what they might be interested in, and appropriate scriptures may not come immediately to mind, while there they are referenced in the literature.

In fact, a LOT of witnessing is done without literature, in informal and impromptu settings. But if there is a question we have to know where to go in the Bible to answer, and there is where the literature is very helpful.

The first century Christians used the codex extensively in their ministry, which was an early form of the book. They had to because they had to go throughout the world in their ministry as Acts 1:8 said. The entire inspired scriptures, including the gospels and the letters from Paul and others that we have today were available by the end of the first century.

Population experts have estimated the world population at that time to be about 300 million. That is about the size of just the United States. Now we are at 7 billion, and each has his or her own things to think about. Jesus said that the works that his disciples will be doing will be greater than those that he did (John 14:12), and certainly that is true considering the sheer scope of the world wide preaching work.

We must maintain our unity of message. For instance, in Africa, as well as here in the US, we believe in one wife for each husband, and they must be faithful to each other. Some "missionaries" from other religions do not insist on that practice in their membership.

The principle is here:

“‘Do not go beyond the things that are written,’ in order that you may not be puffed up individually in favor of the one against the other. For who makes you to differ from another? Indeed, what do you have that you did not receive? If, now, you did indeed receive it, why do you boast as if you did not receive it?”—1 Cor. 4:6, 7.

I would not even bother with it or them, "pearls before swine and what is holy to dogs" comes to mind!