Questions about catholicism?

I am catholic.. but some protestants say the salvation is only through jesus christ not the church... so the church is not the way for the salvation? I was taught the salvation as well include to be in the right church.. but I dont know where in the Bible says that... they say Only jesus is the road... they say catholics we pray to the saints... instead of Jesus.. I said Jesus is God.. then how can he be the mediator between the men and God? why do we pray to saints or Mary? where the BiBLE SAYS it's correct that?