Um, depends on the religion, doesn't it? There have been religions where the whole point was simply to keep the sky god happy so he'd send down rain and make the crops grow. People sacrificed little kids or cut out the hearts of their enemies to appease said god and get those crops. You're assuming that religion is the ethics of a society, the aim to be "spiritual" and such. But it doesn't have to be. Religion means worshiping something divine through ritual. I mean, how many people do you know who joined a religion to better themselves? Or who pray to god to be a better person? Most I know pray to god to heal a sick relative, or help them find a job or keep them and their loved ones safe.
In addition, the definition of "betterment" is a little fuzzy. There are devoutly religious countries that are putting homosexuals to death asserting that being gay goes against "betterment" to the point where it's better to murder them. They would say that's "betterment"...we would not. There are men who will kill women in their families who don't uphold certain traditions of wearing certain outfits, or acting in a submissive and obedient manner. They call these "honor" killings and they would probably argue that the women were making the family unspiritual, unethical—that killing them makes things better.
Which is all to say, people have a way of defining "betterment" to suit themselves rather than to genuinely better themselves. Especially when "betterment" relates to religion and traditions—many of which are followed to maintain a social comfort zone rather than to actually better anyone.
Finally, remember what I said about the Hierophant. This is the belief that traditions and ritual create a spiritual connection which, in turn, they believe betters people. This means that you don't have to actually do good things or be ethical. The rituals are magic, and they will transform you. Not all Hierophants think that way. But your Hierophant might.
One of the point of a particular religion might be betterment. But it doesn't have to be, and even if it is, it's rarely the "whole" point. Usually a lot more of the "whole point" is having god's ear (by doing what god wants you to do), and so having supernatural powers. I.e. god hears your prayers and answers them in the form of supernatural help, thus solving your problem as nothing else could have. Yes?