What makes you think that God doesn't guide us??
Of course he guides us all the time - as long as we open our hearts to him!
I think what you mean is that the Bible doesn't seem to be specific, explicit and clear enough for you to consider it as a 'guide book'. Perhaps that's what you have come to expect the Qu'ran to be: wholly specific, explicit and clear (I personally doubt that it is entirely so ... but that's for another discussion ...)
I agree that there is much in the Bible which is difficult to understand or is confusing or seems contradictory.
But strangely, those are still things which I believe are there to guide us!
The Bible is much more than just an instruction book - it requires us to engage with it, study it, ponder and discuss it, pray about it, question it and be challenged by it!
I love to watch and listen to Christians, when they discuss their understanding of the Bible - even if they have different understandings and interpretations of certain Bible passages.
Ever since the beginning (see Book of Acts) followers of Christ have pondered, discussed and tried to agree on how best to implement Christ's teachings in every new situation/age/culture/circumstance ...
I believe that is part of engaging with God and being in relationship with him!
Not a day goes by when Biblical teachings don't challenge me to the core!
I certainly do feel God's guidance - directly through his Spirit within me, but also through reading the Bible - through the new insights I gain, but also through the things 'I don't yet get'.
May God be patient with me and continue to guide me.
I feel truly blessed to have been invited on this wonderful journey with God! :statisfie