The idea of God being dead, and that freed from religion humans will be forced to develope into supermen who no longer worship at the false alters, who are no longer spoon feed security in simple packaged religion is flawed. Humans will always seek the path of least resistance, and if that means turned to religion to find the easiest way to be happy with their life, some of them will choose to believe in it.
Darwinism: First darwin didn't know about genes, they were discovered almost a century later and explained the mechanism which darwin's theory suggested existed. (that people inherit traits from their parents - so fat people have fat children, etc.) The idea of survival of the fittest was that some animals random mutation did not benifit them (in fact we know that the majority of mutations have little effect, some cause death - or failure to develop and miscarriage - but most are harmless, the odd few are useful, and when those ones produce more successful individuals in a species those characteristics are the ones which are prefered in the next generation (ie sucessful is defined by the number of offspring that an individual can spawn). Darwin i think said some things about different islands providing different enviroments and in each enviroment a different trait may be the most successful.
Darwin didn't ever talk about maco vs micro evolution because those are just terms made up by creationists. He talked about evolution - a changing of the traits in a given population of animals (and i don't say genepool because Darwin didn't know about genes, he didn't know HOW traits were passed from parent to child, he just knew they were.)
Darwin's ideas were taken up by a scientific community, and furthered to become the evolutionary biology we have today (especially after the discovery of DNA in the 50s) Darwins ideas were also taken up by the Nazi's in the form of social darwinism which proved flawed. (because if the Germans were really a master race they would have wiped out all opposition - thus preventing other genes from procreating, and increasing the chances of Germans genes surviving and being numerous in the next generation. I would note that if they had been successful i doubt there would be anyone left alive to claim that they were morally wrong or evil. We'd all be of the opinion that they were right, and history had proved this.)
Scrooge? the idea that money is more important than happiness - this has been expressed by many people in several threads. (that the poor contribute less to society, because contribution to society is based on the money given rather than the happiness generated) - Each person values different things in their own way. I can not tell you what is more important, or what you should value. I would prefer to be happy than rich(assuming they are or are not mutually exclusive).
Utilitarianism - the idea of usefullness to society, where rationally the greatest good for society means the greatest good for the greatest number of people, and thus whatever you do to the rest your ends are right.
It is not morally acceptable to most people to allow some members of society to suffer, never mind be killed to suit the majority, whatever the ends. Our morales are based largely on emotions rather than rationalizations. That some of us are capable of making up rationalizations to justify our feelings is remarkable. Most of us adhere to some philosophy/ideology which suits our emotional reaction to certain situations. That not everyone reacts emotionally in the same way to the same situation is likely a distinction based on our genes, at least according to the best modern science. Which philosophy/ideology prevails will have proved itself to be better than others simply by it's success, Utilitarianism may not have a chance.
Eugenics - the idea that we can 'play god' and control our own destiny is a tempting one, however we do not have the processing power to predict what will happen in the future, the enviroment we live in is just too complex, we have managed to undestand huge amounts of it, but we have only scratched the surface. Is it safer to allow nature take it's course? Or are we better off supporting genetic diversity at any cost? (thus not choosing any one set of genes, but encouraging many variations to flourish) - that would be the opposite of eugenics, but it doesn't have a name.
Still we lose bio-diversity (the diverse and different gene of life on earth, not just humans) by expanding our homes, taking advantage of natural resources and hunting to extinction. We are creating the natural enviroment which selects the species that will survive in the wild, whether we know it or not.
Is my position clear? I may have been drinking again, so i apologise for any typos...