Thanks for the clarification. Missed your post earlier.
I’ll try to make this short and avoid being lazy

. This is, after all, an internet forum. A way to have some leisure time reading and exchanging ideas, thoughts, etc. Some take it more seriously than others. I don’t take it too seriously.
I was raised in the RCC, I was baptized a month after I was born. I had my 1st Communion, my Confirmation, did Altar Boy duties, was a guest speaker at Catholic retreats, attended two different seminaries (Local diocese and an Augustine one, 2 years each) as a guest, etc. The reason I bring this up is to sum up a Roman Catholic upbringing during my personal life and my academic life. My school was named after St. Phillip the Apostle. Like most of you, I understand where we get the bible from and all the sacrifices and diligent work the Church Fathers performed for us to enjoy what we have today as the Holy Bible.
During one of my retreats, I had some personal issues and I was not “feeling” too gracious. I waited till the end of the sermon and went back to the chapel by myself and walked to the altar and looking straight to the crucified Christ, I thought to myself: "This never happened (thinking about Christ and the entire christian history) and we (people) are just light bulbs (We turn on while we have life and when we die we just become food for worms, there is nothing after that). I immediately passed out and all I remember was seeing this very bright light, almost blinding. I regained my consciousness laying on the couch of the Chapel’s Priest chamber. They carried me there… leaving some space for all the jokes or smart remarks

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I started reading scriptures like never before, completely convinced that what I had been taught for most of the years of my life was completely, and without doubt, true. This is when I went to the St. Augustine seminar (I was in college). During this time, I had so many questions about the history of the Church, the Traditions, the way things were practiced, I believed the word of God but I wanted to understand the practices if the Church, I realized that some of the things were not included in scripture and I was eager to understand the reasoning behind the practices. All I got most of the time was: “That is a mystery of Faith, just do what you are told and follow your heart”… So, I left the church.
I went on to practice, almost every other religion/divination/etc practice (Santeria, Spiritualism, Pentecostal church) that I could get my hands into. Quickly realizing that they were all lacking the solid apostolic teaching of the Catholic Church.
So I left religion completely.
Fast forward, I discovered Martin Luther… I know, I know… a fellow angry ex-catholic

. The Lord received me with open arms and I have not looked back since. I am doing the works He wants me to do and I try with all my might to stay obedient to Him. I have to admit that my Christian foundation is almost completely Catholic, which drive some of my non catholic brothers and friends a little crazy

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So, to answer your question more directly… I know the Bible is the word of God because the Catholic Church taught me so and He revealed it to me. That is just my personal experience and I will take it to the grave with me

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There, I played along and shared some experiences. Hopefully this doesn’t come back to bite me (or flame me)
God Bless (And I really mean it)