How to deal with suffering and losing faith?

I came across this section by chance, and read another question by a person with misanthropic feelings. I read all the answers because I feel the same as her. I've always been spiritual with an interest in Buddhism and Taoism, but it seems to slip away. I too suffered a lot because of others, but what really got me into this misanthropic state is the suffering of so many animals at the hands of humans. It saddens me so much and I begin hating people because of it. Not all people, just a lot. It also saddens me a lot to see children suffering but because they turn possibly into cruel people themselves. The plight of animals gets me more. I find them more special and innocent than people yet they have to suffer so much. A lot anyway. Now, the responses to that other persons question helped me realize some things, but I'm still struggling with the suffering of animals. Why can't they be spared if suffering is a tool to evolve? Studying psychology, biology, anthropology and neuroscience I can't help thinking that humans are acting based on chemical, biological or psychological reactions of the brain. There is no enlightenment, just another religious promise - like heaven, enlightenment or the 11 virgins - depending on the belief. I feel like I have no more answers, only confusion and questions, and i also feel like I've reached a point where I'm so fed up with the suffering of animals, children or good people. I'm so tired of it all. Not in a sense that i want to hurt those cruel people, but in a sense of wanting to leave it all behind. But if i did, then I wouldn't be around anymore to help loved ones or some of the animals. Emotionally I suffer because I can't make even a dent and physically because I work hard to help out as many as I can.