Me thinking: please don't say the Bible, please don't say the Bible! The Bible. Because when I was young and I tried reading it I realized that even though millions and millions of perfectly functioning adults believe in something, it might be absolutely wrong or based on basically nothing.
Even as a confident Christian, there are many people who profess to be Christians but who have a very different understanding of what that means than I.
To me, being a Christian is about having faith in Christ's divinity and the truthfulness of His message, and striving to live my life as is asked of me. I often fail, but I persist.
To others this seemingly cannot be the case, because they attribute words, actions, and attitudes to Christ and to God that serve only themselves and are at odds with scripture.