It’s an interesting claim, but it immediately raises a question: What is biblical Christianity? Catholics claim to base themselves on the Bible. Orthodox Christians do too. Protestants as well. And even among Protestants, there are thousands of denominations that disagree with one another on even important points. If all religions other than biblical Christianity are false, then we must first determine which version of Christianity is the correct one: Catholicism? Orthodoxy? Protestantism? Which one, and why? The problem is that each side appeals to the same Bible to defend doctrines that are sometimes contradictory. This is precisely what makes it difficult to assert that only one interpretation is obviously correct and all others false. And to recall: All branches cannot be true at the same time. Either only one is true, or they are all false.