Thank you for those replies. Firstly, I think I would find it difficult to separate out what is the essence. For example, a lot of the SB talks about Krishna as being God; but I can't make myself believe that God is that person because the fact that is says so in that book isn't quite enough.
And, secondly, it's not just the Srimad Bhagavatam. That was just an example. When Jehovah's Witnesses or people like that come to my house and show me bits of the Bible that prove what they are saying is true, it just seems pointless because they haven't explained to me first why I should take that book so seriously. And it would be the same with Muslims and the Qu'ran. I just don't get why we can or should believe in these books.
In any case they all say different things and you have to make your own decisions, which is like depending on your own mental and intellectual powers in the end.