"It's True Because the Bible Says It."
This is a tough one, because the Bible is, in fact, the true and inerrant word of God. And so, “It’s true because the Bible says it,” isn’t necessarily wrong, but the way in which this statement is used often is.
Consider this. Even within a single denomination, churches interpret the Bible in vastly different ways—this is because we are flawed human beings who are relying on our flawed human minds to interpret the word of God. We’re not always going to get it right.
And so it’s not useful to simply say, “Because the Bible says so” in a disagreement with another believer—you very well may be misinterpreting a verse. Instead, when someone challenges one of your beliefs, why not listen, and then look over the pertinent verses with them? If things don’t line up, one of you is wrong, and it very well could be you!
Using this statement on a non-believer is even more futile. Think about how you would respond if someone of another faith made a certain claim because their holy book “says it’s true.” Would you take their words at face value? Probably not—your beliefs aren’t rooted in their religion.
So instead of using a canned line in response to a non-believer challenging your faith, why not take the time to explain what you believe, and why you believe it?
Instead of stopping the conversation, you’ve just started one, and that is what makes a difference in people’s lives.