I do understand that and I'm not making a religious statement. Merely stating facts with Legos. The matter we are made up of are the Legos. We are the sum of the parts. When we die those parts go on to be part of other things. Now why that happens is that science has not yet caught up :)
The aspect of it that people are objecting to is that it does try to explain why. It says "Your father needs to go back in the box so we can make other people", which simply isn't true.