for followers of jesus God doesn't really reward or accept our actions if we are not doing things from a place of love for others. note especially verse 3 below. so, if someone is a christian martyr but their actions weren't done out of love (i.e. whatever caused them to be persecuted) God is not impressed. if that isn't a high standard of love i don't know what is. also, the very first of the 10 commandments is basically "love God and love others". it's all about love but it ain't easy. personally, i don't know any followers of jesus who do good things for the rewards they may receive in heaven. they are doing good because they are trying to love God and love others as well as they know how. do lots of people of all faiths screw up? yes, definitely. and...one doesn't need to be a person of faith to screw up.
eta: i agree that the question is quite flawed. why do you assume people without religion can have unselfish motives? i find that rather specious.1 If I speak in the tongues of men and of angels, but have not love, I am only a resounding gong or a clanging cymbal. 2 If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have a faith that can move mountains, but have not love, I am nothing. 3 If I give all I possess to the poor and surrender my body to the flames, but have not love, I gain nothing. 4 Love is patient, love is kind. It does not envy, it does not boast, it is not proud. 5 It is not rude, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. 6 Love does not delight in evil but rejoices with the truth. 7 It always protects, always trusts, always hopes, always perseveres. 8 Love never fails. 1 Corinthians 13:1-8