I have contended that, in some ways, Christianity is one of the most selfish religions in the world, we are just much more long-term in our selfishness than others.
For example, one reads of people who have gone without in the short-term (i.e. the guy who starts a small business and all his money goes to that business and he lives like a pauper) in order to prosper in the long-term (that business becomes a global conglomerate and our man who sacrificed so much is now a multi-billionaire).
For Christians, the short-term is our Earthly life, but the long-term is eternity. Look at the most pious of Saints who suffered greatly for their faith and did much for others. In the short-term, their life was tough, but in the long-term, they are in Heaven. In the judgment of the goats and sheep, the goats are sent to Hell for ignoring the poor, imprisoned, orphans, etc., while the sheep who tended to the needs of the “least of these” are Saved. At the simplest level, why should we care about helping the “least of these” except that we want to avoid Hell/enter Heaven (regardless of how you phrase it: desiring to avoid Hell or desiring to enter Heaven, it’s six of one and half a dozen of the other).
Even going the beyond minimum (adhering to the evangelical counsels, doing more than just the minimum, doing self-sacrificial acts, etc.) is about either:
- Ensuring one’s entry into Heaven
- Meriting greater reward in Heaven (akin to the person who makes sacrifices in the short-term so that they are wealthy later on)
Martyrdom is the ultimate expression of this long-term self-interest. Sure, being killed and tortured sucks, but Hell (the punishment for renouncing your faith) sucks even more.
After all, would anyone really care anymore if there were no Hell and everyone would be treated the same in Heaven?