The Bible is sufficient to save you from your sin and show you the right way to live however God clearly knows more than what is written in his Word. Human beings are not capable of complete comprehension of God using the Bible even if they insist it is possible. I have seen people in the past assert that certain teachings are true based on the Bible but their assertions appear flimsy when reviewed against other Bible verses.
God’s word acts similar to a powerful medication that is highly addictive with positive side effects. Anyone can replace their negative addictions with truth from the Bible that Jesus forgives you your sins and sets you free. Medications sometimes need to be taken in the right manner or they may make you sick. The Bible can easily be misused by well meaning people. You need to study the Bible yourself and compare it to what you are being told.
Only Jesus is perfect and capable of replacing your real problems with peace. Christians are not perfect and will not ever be perfect during this lifetime. Any one that tells you that you can achieve perfection on earth is wrong.
There is much that we don’t know about God but most of what we do know is simple enough to understand and very practical. The Bible works in real life for many people in spite of its vocal critics. A practical life altering method for changing a person for the better is rare. A person who’s sins are forgiven understands that difference but may not understand everything in the Bible.
I certainly don’t understand every word in the Bible but I know a working system when I see one. The Bible works but the Bible itself indicates that all of God’s knowledge has not been given to humanity. A person can only grasp limited aspects of God at any one time. Complete understanding of God is simply not possible even with the Bible.
“As the heavens are higher than the earth, so are my ways higher than your ways and my thoughts than your thoughts. ”
Isaiah 55:9 NIV