Loss of "faith" in buddhism

I've never had any religion throughout my childhood and adolescence, and at the age of 18 I had my first contacts with buddhism; It seemed fascinating, and I kept reading about all the things I could find about it. Everything just seemed right, because I was truly convinced by this idea that the truth lies within, and I just saw the buddha as someone who had found it. It seemed to be the "no **trust-my-words** religion". Recently I bought a buddhism book. It was an interesting reading, but somethings were discussed that I haddn't seen with this emphasis: karma and rebirth in other worlds. The thing is that, after that, I became VERY skeptical when I learned that those things come from hinduism. It seems to be the religion that existed before buddhism, and it has karma, it has the samsara, the liberation (which is a little different), the worlds, the **gods**... And it's just seems as though the current culture at the time and location buddhism took place **influenced buddhism itself**, poisoning it with the same kind of dogmas other religions have - man-made dogmas, made up truths. In short, my problem is that following buddhism started to seem like following christianity, or islam - just another religion that it's followers think they are right and everyone else is wrong. Why is buddhism any different? It seemed right, now it feels overwhelming and almost crazy. I want to follow buddhism, but those hindu concepts make it become yet another trust-my-word religion. I'm seriously disappointed.