Logical Religion P6.0- What's Religion?

Religion is following a set of rules that you believe in.
Blind religion is following a set of rules set by someone else, whom you believe in, but following the letter not the spirit.

Right and Wrong, Good and Bad, is all relative. Everyone knows that. Even a bunch of HSBC ads can show that.

But then what makes us fight for our religion? What makes us stand up tell others to convert or burn in hell (Yes, I know that hinduism, jainism or buddhism don't convert) Why do ALL religions degrade after a certain period of time?

Is it that religion becomes a structure for power in time? And that our individualist quests do not fit in with the overall concept of good for everyone else?
Is it that religion becomes a beacon for a type of culture? And conversions ensure a very diplomatic way of spreading our way of life? Ensuring that WE don't have to change?