The Bible says nothing about the triune existence of the Trinity.
Neither will you find the word "Trinity"....but, nonetheless, you believe in the Father, the Son and the Holy Spirit, don't you?
Sure, and I can find "Father", "Son", and "Holy Spirit" in the bible without much effort.
But you do refer to the three persons as the Trinity, and the word Trinity is not found in the Bible. Just responding to your claim that "I couldn't find Mr. (Saint) Boniface in my bible."
But you will find the word Saint.