IS SOY PROTEIN BAD FOR YOU!?

So i'm like really skinny so I started working out at the gym. I can't eat much at all because of my high metabolism and my small stomach, so I decided to get some protein shake powders I went to the GNC next door and got some soy protein because people say it will help you build muscle and stuff. I don't eat whey because I am Muslim and we can't eat pork or any animal that has not been killed by a Muslim and some whey protein powders use enzymes that come from animals. The other day a guy told me that Soy Protein is bad for you and can give you man boobs, is this true? After reading online a bit, I also found out that it can kill your sperm cells too. Is it really that bad. What would you recommend for me to do? I just want to take something that would help me build muscle. Also, do you know any why protein that I could take that doesn't have any animal products at all? Thanks!