[Darryl_P]

I think the morally correct thing to do would be first to find out if they really consider those things better that you do, ie. a longer life. Just ask them...would they like to live longer? If they say yes, then ask what they would be willing to trade for it. It could be you'll get stuck at the first question because they believe in an afterlife which is better than their current life and nothing can shake their beliefs. Of course you can try to convince them in various ways, but if they still don't buy in to it, then your only two reasonable choices IMO would be to adopt their values and blend in, or leave.

Of course if you had enough resources to overpower them, you could take them over and create your own society in which they will have the same two choices.