The shared side of religion ?
Religion is something that allows an otherwise perfect and logical person to committ horrible (often genocidal) crime against people of their faith with differing views and to other faiths.
Yes, sadly it can do that, as others have intimated, but it shouldn't have to.
If everyone accepted that the universe is a wonderful place which may ~ or may not ~ have a supreme intelligece or power behind it, and that some people wished to worship that as 'God', in their own way, according to their own culture, there should be no problem.
Buddhism seems to be a very peaceful religion. Hindusim seems very accepting & peaceful. The Scriptures of both Christian & Jew, say 'thou shalt not murder'. I haven't read the Quran, but I have seen excerpts which promote peace.
Unfortunately, there are also religious writings that promote slaughter. I have seen them in the Old Testament, for example.
In this day and age, with all the knowledge and education of the 21st century available, when we know that we are all closely related and that we have to share a world that seems to be ever-diminshing in size, there must surely be a way of accepting each other's creeds peacefully.
The thing is, though, it's not just about religion, it's also about politics, economics, power, ethnic differences, cultural differences, lack of education, lack of understanding, etc, etc.