Religion is not a bad thing. It is a tool. In essence religion is a tool to find inner peace and unite people. This is the strength of religion. But at the same time this is also the weakness of religion. Religion can be used for good and bad. As has been shown many times. A good use of religion would be to educate people and give them hope which was it's original intention. Without hope or a drive most people turn into savages.
I will give some of my idea's of history :
Feel free to check.
My idea on religions extremely summed up :
Many christian believers talk of the start of humanity 6000 years ago.
The fun part is that the fundamentals of the bible for example can be traced back to the time of Sumer. This society by some called "Cradle of civilization" also started around 6000 years ago around the position on the earth where most tribal religions (also multiple jewish religions)where formed and later on fused together or have been eradicated. It is fun to know that many of the (pre islamic)arabic gods at those times have much similarity with the jewish gods/angels and the cristian god/angels and even the egyptian gods.
For a more recent example in europe, look at what happened to the gnostici who where eradicated by the catholic church.
http://en.wikipedia.org/wiki/Sumer
However :
The roman catholic church was at the beginning someones ideal to teach people not only about god but also give them a basic education of values. This was more the real christian way. Later on in the timeframe what is for us history the catholic church got perverted and abused as a powerbase. The all known middle ages and dark ages.
The islam :
It is hard to imagine for most people in the west, that the islam actually is pro education and freedom. The madrasahs or mosque schools where a good example. The first one seemed to have originated in Fes, Morocco. But iam not 100% sure about this. This early form of university was to educate people. Originally Muhammed and his wife Khadijah did this. Compare that to al quada for example. Or how the people live in Afghanistan. In a tribal way of life without rights or education for the girls/women.
After the death of Khadijah and Muhammed of course, some people wanted to stay in power and the islam was continued. (Here much similarities can be found in the formation of the idea's of Jesus and the later formation of the catholic church.)
The fun part is what the christian / catholic church set out to do, is the same as what the islam was set out to do. To educate people. As always these religions are occasionally abused for personal gains by powerhungry people who live as parasitic lifeforms upon other people who life in pain and despair. Feeding their hate, confusing those poor people more while using them for their own twisted gain of power. In my opinion these bishops/priests/imans who preach hate and murder should be taken for psychological research and be confined in prison dungeons for the rest of their remaining lives.
Now i have not even started about many other religions with their own flaws.
I am a non believer by the way, who thinks education is the path to freedom and inner peace. I will keep learning though, since i am human...
Because when i know all there is to know i will not have to make mistakes and live those mistakes and then start over again. As so many people do...
Oh well, At least it keeps the brain fresh
EDIT:
Of course today we have schools and universities and separation of church and government.
But when looking more closely on the politics level, life is not that simple. How to keep everybody happy ?