Look for more subtle cues as to weather they are paying attention if it's not the culture to say 'amen' a lot.I remember once I was in Indonesia at a conference held at a Charismatic church there. They had an African preacher up there on stage when we got there, screaming and yelling about how bad Saul of Tarsus was, looking like a deer caught in the headlights, staring anxiously at the audience. It seemed like he was worried at the lack of 'amens' and other displays of enthusiasm he probably got from his African audiences back home. He finished up and got off the stage. Indonesians tend to be a bit reserved during the sermon. Some of the churches (COGs especially) tell everyone to speak in tongues, and they get loud doing that, but very quiet during sermons. The only church I heard of where they say loud amen's and such is the Gereja something or other Nusantara, which is the local branch of what used to be called the Boston Church of Christ, the one known for its heavy shepherding. I haven't been to one of their meetings, but my wife did many years ago with her cousin who was in it, and they said amen a lot and stuff like that