The men who helped develop the Christian Church (Disciples of Christ) believed that man made creeds caused divisions in the church. For that reason they determined that we should never adopt a creed as a test of faith. An early slogan of the church was "No creed but Christ, no book but the Bible."
Over the years some people have interpreted that to mean that we can believe anything we want. That is really not the case. What it does do is to put the responsibility on each one of us to study the Bible intently and with great care to discover what Christ wants us to believe. Our personal growth in faith and understanding of the scriptures is up to us. The church offers the tools and opportunities for growth, BUT we must take them and make the best use of them.
What you believe about God, Christ, and the church is very important. Believing anything is not acceptable. Discovering what Jesus says in the Bible is what counts. Growing in faith and understanding day by day is vital to our Christian life. Learning how to be faithful to Jesus the Christ is a life long endeavor. None of us is ever too old to study the scriptures and some of us may have forgotten some of what we did know. There is always more we can learn about the teachings of Jesus. Think you already know enough about the Bible? Then you should be teaching the rest of us.