The Bible is an inspired Book, not revealed literally as the Koran. It is the Revelation, yes, but the Holy Spirit used human beings and their God-given talents to write it. That's why it needs interpretation and the Church has kept the deposit of Tradition and we have the Magisterium. When everyone follows their own understanding and interprets it without proper preparation, from their human standpoint and especially when they lack a Christian background and education, everyone has their own incomplete interpretation and sects multiply. But Tradition is a whole and makes sense as a whole. It's not strange but natural to want to understand. But that doesn't mean everybody is capable of understanding. You need orientation.