Center for Reformed Theology and Apologetics. CRTA is dedicated to providing biblically sound online resources for the edification of God's people. The Center is committed to the system of doctrine known as Calvinism, which we see to be the most biblically faithful systematization of the Bible's teachings. The Owner is a Reformed Christian committed to a strict subscriptionist view of the Westminster Standards, yet many of the articles on this site represent a wider view of the Faith