Religion is a device to control the masses huh? Maybe by some, but the concept of "social justice" can be used the same way, in fact any ideal or ideology can be subverted for the sake of those with power. Religion is hardly unique in this regard.
What might surprise you is that the religious actually are statistically more charitable than their non-religious counterparts. Religion has actually been a great motivator of noble undertakings in the world, in fact, I would have thought exactly the opposite, when you made your criticism of believing in another world, that they would have more hope in bringing about their change since they believe one day there will be a better world. That seems like more of an argument about what perspective to take on their ideas, and I think it would be unfair to smear everyone with a broad brush.
Lastly what is most important is everyone of conflicting ideologies religious and non-religious seem to be claiming that the "other guys" are "bad guys" as if they some how didn't want a better world, and didn't care if things were the way they were or worse had some vested interest in keeping them that way or making things worse. Keep in mind, everyone wants a better world, and everyone thinks their ideas are the ways of getting there. Each side accuses the other side of not wanting to have open-minded discussions, everyone on whichever side are all liars or fools on the other. No one ideology is solely to blame, its not "the religious people's fault" that's just an excuse to get rid of or cloak our own ideologies' unfulfilled responsibilities.
Until people begin treating those they disagree with as intelligent and rational people who are looking for a better world as well, not as clueless suckers, or liars, then they are going to keep blaming each other for the worlds problems and nothing is going to get done.