I was consciously raised by my parents to be free to make my own choices regarding religions and philosophy, for which I shall be eternally grateful. I was and am predominantly an atheist, although I'm happy to entertain the notion of a cosmic universe-creating force of nature that some might call 'god', but others might call the natural laws of reality.
I think that in the absence of focused religious indoctrination at a young age, and if information about how the world works were made available to them, nearly all children would end up atheist, or at least agnostic. As I see it, religious thinking originated from the drive to explain the unexplainable, and therefore from ignorance. However, it continues to spread itself through the generations in spite of all the new information we have as a species, because it usually has as a central tenet the drive to pass it on to others - leaving children a prime target, because they have not yet formed their own understanding of the world.
To me, the idea of faith, as belief in the absence of evidence, is inherently ludicrous. The beliefs and writings extolled by the various religions seem to me to be quite transparently a collection of ancient superstitions, folk tales, morality fables, propaganda and retconning. I've never really been able to fully get my head around how anyone could take it all seriously.
Now, there's plenty of good stuff in the teachings of most religions, I'm not denying that. To take the most obvious example, Jesus, as he is written in the Bible, seems like a class act. I have no problem with looking on the Bible and other religious texts as historical manuscripts of cultural importance, but I think that more and more the good stuff/core teachings of religions are ignored, and the pointless and obviously archaic stuff is made a big deal of.
I worry about the effect religion continues to have on the world, because I think that it does more harm than good. It may make many people happier in their lives, but is that worth all the religious extremists, the interference in education (the evolution/creationist 'debate' - hah!), and the hampering of scientific progress such as stem-cell based medical research, based upon religious belief alone? Faith is a terrifying force because it cannot be touched by reason; if somebody truly believes that another group of people are evil and godless, it makes it much more likely that they commit downright stupid acts that defy common sense.
Another thing I dislike about most religions is the emphasis on the afterlife over this life. They restrict people's behaviour in this life, but promise 'paradise' after they die. The fact is, nobody can possiblity know what happens after death, but I see no reason to believe that anything happens at all, except oblivion. That religious people purposefully narrow their experiences in this life, which is quite probably the only life we are given, because they're holding out for heaven, seems like a huge waste to me. On top of that, religions are bullies, because they also threaten their followers with Hell - the perfect way to control people by fear.