Why would God not just give us the Bible in an unchangable form
He has.
The canon of Scripture was closed hundreds of years ago - no one can add books, doctrines or teachings, or take them away.
God has given some people the ability to translate his word into other languages.
Why would God's word be at all hard to understand?
It mostly isn't. But it reveals truth about an infinite, infallible, immortal God to human beings who only have finite minds.
If I or anyone can be more coherent than Gods' word at any time, then His word is not perfect. Why does God claim to not be the author of confusion, yet make His book confusing at all? Why would I or anyone ever be confused by it?
He hasn't
made his word confusing. We sometimes find it so because we are trying to understand mysteries and deep, spiritual truths. People also interpret the Bible in different ways, and have different ideas about what is important.
For example, some people get bogged down by the creation/evolution debate and believe that if we say anything other than "God made the world in 6 days", then we are doubting the Bible. Others say that the teaching about female Pastors/ministers is of utmost importance and, again, might mean that we don't believe the Bible if we don't believe the "right" thing about this. Sometimes people say that their interpretation of Scripture is the only correct one, and sometimes, it seems, people don't know how to read and understand it at all.
It's we humans who complicate things.
Also, there is the probem of hearing voices being a mental disorder, so how could I possibly know what is God's voice and what is my own?
That's why we have, and need, the Bible. God will not say anything that is not found in Scripture.
For example, Moonies have tried to tell me that "Rev" Moon was the Messiah and received a special message from Jesus saying that he (Jesus) had failed while he was on earth and "Rev" Moon needed to take over his work. They say that Jesus was supposed to get married and start a family, not get himself killed. However, the Bible (which they claim to believe) doesn't say anything of the kind and does not say that Jesus failed in his mission. So, however many Moonies claim that God spoke to "Rev" Moon with this message - I can say with certainty that he didn't.
It also makes no sense for God to use humans to send His message. We are supposedly flawed, while He is not. Why use a bad method, especially when the importance of the message is so high?
If God spoke to us directly, would we listen?
Seriously, if there was thunder, lightening and the voice of God suddenly boomed from out of the sky, would we fall to our knees and say "speak Lord, your servant is listening", or would we write it off as alien contact, uncertain weather patterns etc? If a person doesn't believe in God and God speaks, how are they likely to recognise that it is God speaking, when they don't believe in him.
There are at least 2 places in the Gospels that say just this - that God spoke audibly from heaven. Yet very few people recognised his voice and took any notice.
I would write more, but I am not sure we should be discussing this on this thread - so it could get closed for being off topic. This is for the discussion of Romans 8:28.
But if you want to start another thread on this subject, that would be good. More people may then see it and be able to join in.