A few more comments on some of the other topics:
The Pie Chart: Yeah, you've got to wonder how accurate something like that could ever be. Like one person mentioned, China accounts for a big chunk of the world's population, but as a nation their official religion is Atheist (as is the case with all Communist governments). At one point China had the world's largest Buddhist population, some estimates putting it at around 300 million. That would at least double the percentage of Buddhists in the world (which in some cases shouldn't even be considered a religion, but that's a whole 'nother topic).
Homosexuality: I think one of the major topics of disagreement is whether it is a choice or if people are born homosexual. I personally believe that it's a choice, but whatever two consenting adults want to do in the privacy of their own home is none of my business as long as it's not hurting anyone else. I don't see any reason why they shouldn't be allowed to have a legal marriage if they so choose, however, there are some issues that come along with that which a lot of people aren't comfortable with. I don't see why they shouldn't get some of the benefits of marriage (i.e., tax breaks, health insurance, etc), but I don't support the idea of homosexual couples adopting children. I just don't see how a child could grow up with two moms or two dads in a homosexual union and not be a little bit screwed up. Throughout my life I've met and known a sufficient number of gays to form the idea that although many of them lead pretty decent, well-adjusted lives, most of them (at least the folks I've known) have some very deep emotional problems. This may of course be due to a lifetime of hurt inflicted by closed minded family, friends, and society, but it's true none the less. If someone chooses this path for themselves in their search for happiness, so be it. But I would rather not subject a child to the same issues if it wasn't his/her choice.
As for marriage not being man made, well, that's an opinion. It's my opinion that religion is man-made, therefore marriage is man-made. And regardless, there are plenty of non-religious people out there who choose to unite with another person for personal and legal reasons. In today's society there IS a need for marriage and to non-religious folks, it has nothing to do with your God.