How can I believe the bible if I don't understand it? And how can I understand the bible, if I don't believe it?

A Jehovah's Witness said "You cannot understand God's word, without the spirit of Jesus' God and Father. (Eph 1:17)". Source: https://answers.yahoo.com/question/index?qid=20190419023619AAf9FYn Isn't this a Catch-22? Wasn't the bible was written for everyone, including atheists like... show more A Jehovah's Witness said "You cannot understand God's word, without the spirit of Jesus' God and Father. (Eph 1:17)". Source: https://answers.yahoo.com/question/index?qid=20190419023619AAf9FYn

Isn't this a Catch-22? Wasn't the bible was written for everyone, including atheists like myself? Or was it written just for Christians? Or was it written exclusively for a specific Christian sect, like Jehovah's Witnesses? If so, does that mean it's completely useless to all other Christians, Muslims, Atheists, Jews, etc? And how do we reliably determine which Christians have this "spirit of Jesus' God and Father"? And how do we know if an atheist suddenly gets this "spirit"? Would it even be possible?

I thought the Bible was sharper than a double edged sword and so on... (Hebrews 4:12). Or not... Maybe I'm just doomed to remain an atheist... not that it's a bad thing.

I'm just trying to understand why Christians say the things they say, and how they justify their understanding of scripture as the correct one. Curiosity has overcome me on this one.
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