Personally, I see religion as a base to set my beliefs.
My family and I are all Roman Catholics and have all gone through the Catholic school system. Whilst I question my own religion and picked up many flaws in its text, ie the 7 days of creation, I still remain strong to my belief.
Stability and Control
Religion can be used to keep stability and control in communities that may be experiencing hard-times.
Ignoring the 'holy wars' that are taking place, lets focus on the more developed communities because Im sure that is where alot of you reside and can relate alot to what is said to your lives.
Anyway, Religion is a perfect way to develop morals and values in all of us.
Alot of religions focus on respect, love, compassion, understanding and peace within not only ourselves, but int he relations between ourselves and other strangers.
A couple of examples are Buddhism, you search to seek the actions and consequences and accept that the person who did bad to you, is simply a consequence of someones actions towards them, and you may choose to pass on the consequence to another, or accept the fact you just got duped.
Catholicism is another, treat others the way you would like to be treated, the 10 commandments and the beatitudes, all showing what the scholars of the time believed to be the perfect attitude to obtain a peace in the world.
Religions like these are what keep alot of communities together, and its the morals and values presented in religions at an early age are what form alot of the developing childs adult mind.
The Afterlife
A common comfort to those sick, dying, weak minded or insecure about death.
Alot of people need an afterlife. They cannot live with the thought they are simply here, with no purpose or reason to live and no outcome.
A non-existant belief in the afterlife can cause rebellious behaviour, because the person feels that there is no 'god' to punish for murderous acts, and that they can escape authorities easily.
On the other hand, a non-belief in afterlife can cause one to fear death, making them submit to what they are told and understand, that if they do not want to die then they shall not kill another.
The meaning of afterlife changes from one person to another, one person may believe something similar to what is presented in Harry Potter, where he is sent to a symbolic place (in his case, the train station at Kings Cross) and he confronts his old headmaster, where he is given a chance to have everything explained to him, others may believe that they go to judgement, where their sins are wieghed against their good deeds and they are punished accordingly, or some may believe they are reborn in another form, wiped of their memory to start afresh with their success in life determines by their actions in a previous life.
There are more but they were the first ones to stick in my head.
A life without Religion
Those who are strong enough will not find a problem with living without religion, but we need to empathise for other people and accept the fact they cannot live knowing everything they worked for will be gone and they will never have life again.
The two main things people use to substitute religion are Money and Work, which both tie into each other. They focus on work, they increase their income, they increase their income they can upgrade their home, car, etc. Giving them a satisfaction in themselves to overcome the emptiness of no belief.
Not only working for money, but also working around the house, such as gardening, over obsessing about a houses appearence or taking on a project (eg/ building a shed, fixing a car, etc.)
Without religion, I believe, the world could be a better place. If there were no religion in the world, the crisis in the middle east wouldnt have happened, numberous lifes wouldnt have been taken, alot of wars in history wouldnt have formed and people today wouldnt waste time going to church, and would focus on more important things in their life.
I wanted to write more but I've run out of time, sorry.