I am an atheist, but I grew up in a Christian household. I also have met many people of many different faiths. I see a lot of guilt associated with religious upbringing.
I think children are very easy to indoctrinate, which is why I think it is hard for some people to easily get rid of their childhood beliefs.
It sounds like Lobster needs to find out what he reallly believes and go with that. Create a foundation of beliefs and see how it works out.
For exanple, he could decide that there is a god and this god's focus is on love. Or he could start with Christianity and figure out which version he wants to be true.
I think the best book to help someone become less religious is to read the Old Testament. But try to read it and ask the question, "What would an outsider to the religion think of this?"