Christians..have u read Conversations with God by neale donald walsch?pls help am confused..?

am a christian and i certainly believe in the bible however i encountered this book denying the authenticity of the bible and the authorization of preachers and ministers etc..the book is really convincing that it nearly destroyed my foundation as a christian...i need a guidance on this book..i mean its blasphemous.. am i supposed to believe?...pls help...i want some serious answers pls