I don't know the book, horseshoe, but I only tell you where I am on this. I'm a Christian but no longer belong to a mainstream church - I used to be very active in the CofE to the extent I nearly started training for the priesthood. I realised over the past year or so that you can never believe without questions - I have far more questions than answers - but that the conventional answers given by the church are very unsatisfactory. The Bible is a wonderful book and a great insight into the life of Jesus but it cannot be 100% accurate - it was written down by people, particularly men, all with their own ideas and agendas, and since then it has been edited by people with their own preconceptions. I am sure you have heard of the publication of the Gospel of Judas today, which comes from the Gnostic tradition, and supressed in the early centuries of Christianity. Had the Gnostics held the balance of power rather than the Roman church, we'd all be believing something very different.
There are a lot of books that take a new view of Christianity. I'm currently reading a book called Meeting Jesus Again for the First Time by Marcus Borg and it is fab - it strips away all the superstition around Jesus and, for me at any rate, has made him come more alive and be more interesting than any other book I've read, apart from the Bible.
In terms of places to look for answers, I really don't want to offend anyone but personally I find Alpha a bit too certain. Alpha helps many people but it only represents one stream of Christian thought and may not be right for you. Right now I find even ordinary Anglicanism too restrictive - I found I was being told what to think, and because I could no longer agree with it, I nearly lost my faith altogether. Now my faith is much stronger but I am having to find my own way to what I believe, through prayer, reading the Bible and other spiritual works, and through other people. God isn't 'out there', he/she is in everything, including other people, and particularly wherever love is shown.
Two liberal approaches to faith that you might like to engage with, that come from Christianity but do not have creeds, doctrines etc to which you have to believe in, are the Quakers and the Unitarians. Quaker worship is silent and is very much about waiting on God - it's about experiencing God rather than using too many words, although people do sometimes feel promted to speak. Unitarian worship is more along the lines of a traditional service and includes songs, a Bible reading, a reading from a spiritual text (not necessarily Christian), and a reflection. The Unitarians have sacraments like Communion and Baptism available. Both faiths have informative websites and you can get books on both - again, try Amazon. The Quakers in particular have a really useful introductory pack including a book that they will send out free via their website.
If you do want something more mainstream then I second the suggestion of trying somewhere like Worth Abbey.
HTH.