How is one defining religious? Even an atheist can be religious!
Each has a unique perspective to offer in response to the OP question.
For me, I don't worry about life after death - I will die soon enough. This life keeps me very busy and there is so much to do.
The fact is - none of us 'knows' about 'life after death'. We can only 'speculate', because as far as we know, it's a one-way door.
I think the term selfish is being used a bit loosely to include self-interest. Having a self-interest is not the same as being selfish. By convention, selfish implies "concerned excessively or exclusively with oneself : seeking or concentrating on one's own advantage, pleasure, or well-being without regard for others". It is the 'disregard for others' that is the key condition, in addition to having an excessive self-interest, for being selfish.
There are many people who are concerned about the welfare, well-being and rights of others.