Belief or knowledge

Hello Rabbi!
I saw in your books that I read a reference to a question that I don’t have a clear answer to. I would be happy if the Rabbi could give me a reasoned and relevant answer to this, since it was difficult for me to extract an answer from the books.
The question is whether faith in God is knowledge, and therefore why is it called “faith,” a word used for something about which I have no certainty but only believe that it is so. Or perhaps the concepts of “faith” and “knowledge” should be explained differently.
Additionally, I heard that the rabbi is going to publish a new book soon that deals more with Judaism, is this true? I look forward to it, because in your books, this is only dealt with in a few chapters at the end of the book. It seems that there is a fear that the book will be considered a “religious” book. But the need is great.
 
Thank you very much and all the best!