As we have seen, many religious truth claims can be investigated and their plausibility determined. Since all conclusions about such claims are based on probability rather than absolute certainty, they all—including atheistic claims—require some amount of faith. As we look at the evidence in the ensuing chapters, we'll see that conclusions such as "God exists" and "the Bible is true" are certain beyond reasonable doubt. Therefore, it takes a lot more faith to be a non-Christian than it does to be a Christian.