Many Christians do not fully understand some parts of the Bible. Others disagree with the interpretations of various parts of the Bible. That, however, is not the same as accepting / rejecting the Bible as God's absolute truth standard and authority.
The huge problem with disbelieving any part of Scripture, is that it undermines one's ability to confidently believe any other part. How can one confidently trust Jesus Christ as one's Savior and Lord based on Scripture, yet, reject the Biblical account of God's creation?
Accepting everything in Scripture as literal is not the basis of Salvation and eternal life. But, stepping back from the truth and authority of God's inspired Scripture is a slippery slope (For more details, see ucanknowthetruth.com).
Just one thing to add: I think that tampering with God's word or commands in any way is an extremely dangerous thing.
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