In response to your observations about the bible being written purely by man and not by God through men,
I addressed this topic earlier when it was raised earlier by someone with the same point of view. It contains these two verses where the Lord says how He had the bible put together:
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2 Peter 1:20-21
"But know this first of all, that no prophecy of Scripture is a matter of one’s own interpretation, for no prophecy was ever made by an act of human will, but men moved by the Holy Spirit spoke from God."
2 Timothy 3:16
"All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness"
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Moving on to some of your other points, you make the assertion (essentially) that the interpretation of the scriptures can go a bunch of different, sometimes conflicting directions depending on who is explaining it. Even the explanation from your dear mama didn't add up to you. A simple answer to that charge (which has some truth to it, BTW) is this: it doesn't matter what people say the scriptures mean.
The only perspective that matters when it comes to the true interpretation of the word of God is God Himself. It is the Holy Spirit that determines how to read the bible in a way that is potentially satisfying to each individual person, but it is only based on the outcome described in 2 Timothy 3:16 above, not what YOU (or anyone) demand from the bible. One important way the Holy Spirit validates the understanding of scripture is, believe it or not, through the scriptures themselves.
The more one studies God word, the more eye opening it becomes when you notice how a perspective expressed in a chapter in the New Testament is backed up by several passages in the Old Testament despite the words being written at times a thousand years apart. So how is one supposed to wade through all of the nonsense to get to God's truth in His word? The Holy Spirit will guide you if you sincerely want to know more about what He has to say as you read it. Jesus said this about the Holy Spirit:
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John 16:13-14
"He will guide you into all the truth; for He will not speak on His own initiative, but whatever He hears, He will speak; and He will disclose to you what is to come. He will glorify Me, for He will take of Mine and will disclose it to you."
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As I said above, the bible backs itself up with other passages. Here is one on this same topic that goes into more detail about how we learn what is on God's mind throughout the bible as revealed
solely by the Holy Spirit:
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1 Corinthians 2:10-12
"For to us God revealed them through the Spirit; for the Spirit searches all things, even the depths of God. For who among men knows the thoughts of a man except the spirit of the man which is in him? Even so the thoughts of God no one knows except the Spirit of God. Now we have received, not the spirit of the world, but the Spirit who is from God, so that we may know the things freely given to us by God, which things we also speak, not in words taught by human wisdom, but in those taught by the Spirit, combining spiritual thoughts with spiritual words."
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So what about those who read various parts of the bible (or simply some of the verses I've posted) and declare it to be nonsense? The bible addresses that as well coincidently in the very next paragraph:
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1 Corinthians 2:13-14
"These things we also speak, not in words which man’s wisdom teaches but which the Holy Spirit teaches, comparing spiritual things with spiritual. But the natural man does not receive the things of the Spirit of God, for they are foolishness to him; nor can he know them, because they are spiritually discerned."
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That last sentence is partially what I shared in response to various people (including someone a few posts up in a link) who say they need "proof" before they believe in God. The bible has the proof, but the scriptures are foolishness to them because they are not emotionally or intellectually discerned, but are spiritually discerned and can only make sense to them when the Holy Spirit reveals their meaning to their spirit (which is the real person inside every human body, according to scriptures).
This is why it is pointless for forum members here to ask me or anyone else they know to prove anything about the bible. Its truths are spiritually discerned, and only the Holy Spirit can make it "real" to them so that they can go to heaven instead oi hell. How does the Holy Spirit reveal it to an unbeliever? There are many passages in the bible that explain it, but here's one where Jesus explained it like this:
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Matthew 13:31-32
He presented another parable to them, saying, “The kingdom of heaven is like a mustard seed, which a man took and sowed in his field; and this is smaller than all other seeds, but when it is full grown, it is larger than the garden plants and becomes a tree, so that the birds of the air come and nest in its branches.”
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Repeatedly, the bible uses the mustard seed as a simile for faith. Despite being the tiniest, observable seed in the ancient world, its full growth becomes immense. Jesus is literally describing that the way one makes it into heaven is to have the faith in God the size of an infinitesimally small mustard seed.... as long as it is real.
One might say, there has to be other ways to reach heaven that would satisfy God (like going through life as a generally good person). The bible refutes that concept over and over again. Here are a few definitive verses:
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Psalm 53:3
"Every one of them has turned aside; together they have become corrupt; there is no one who does good, not even one."
Romans 3:23
"...for all have sinned and fall short of the glory of God."
Hebrews 11:5
"And without faith it is impossible to please Him, for he who comes to God must believe that He is and that He is a rewarder of those who seek Him."
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So how does one acquire that type of faith?
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Romans 3:17
"So then faith comes by hearing, and hearing by the word of God."
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Only the bible, which shares the gospel of Jesus Christ dying for the sins you and I committed and rising from the dead three days later to make heaven available for all is able to generate the mustard seed of faith within you that is being described. No other option is available to avoid hell and make it into heaven. No other interpretation of the scriptures that conflicts with this solution will suffice. All that matters is whether or not you will choose to respond favorably to what God is offering.