Indeed they might. Some of the human sacrifices in pagan Celtic Britain were willing to be consecrated and have their throats slit, because trhey believed they were rewarded with honors inthe Druid heaven.
As another example, certain Islamic muhajidin argue that using Muslim civilians as shields is not morally offensive because if the shield dies, he or she dies as a martyr (shahid) and attains paradise.
All of the arguments against religion are correct, if you find the appropriate false religion to apply them to. I'm no defender of false religions and false gods. Quite the contrary.
These examples illustrate why the underlying standard of morality is necessarily independent of religious claims — otherwise, there is no way to distinguish between various mutually exclusive religious claims on moral subjects and discern which of them are, in fact, based on valid morality.