What has religion done in the past millennia to improve sanitation and cleanliness? Little to nothing. Science, however, has informed us of the ways in which disease can be spread through improperly handled water and poor hygiene. Science has also provided the tools to make water safer to drink and to clean up both ourselves and our surroundings to greatly reduce the risk of disease. Countless people have been saved from sickness and death through this information.
Disease in general is not something which religion has helped fight; on the contrary, myths about the origins of disease have only made things worse. Science, however, has identified the bacteria and viruses which cause disease, how they work, how to fight them, and more. Through evolutionary theory we know that the fight against pathogens is endless because they will constantly evolve, but science gives us the tools to continue the fight with. Religion does not and often inhibits the effort.
Humans today live much longer on average than they used to, with the longest lives occurring in the industrialized West. This is not a coincidence: it is due to the use of science to fight disease, improve hygiene, and most importantly to improve the chances of survival in childhood. People are living longer because they use science to better understand and manipulate the world around them. Religion has not contributed to this.
You're the one without hope and perishing. Not me. Satan has blinded you.
2 Corinthians 4:3-4 (NKJV)
3 But even if our gospel is veiled, it is veiled to those who are perishing, 4 whose minds the god of this age has blinded,