Well I don't totally agree with gospel being only for believers, for it was the urging of the Holy Spirit and gospel music that lead me to salvation. Personally I believe that if you are in a church that is not praising God (singing dancing clapping shouting etc.) than something is up and some form of traditional legalism is involved... the same thing Paul talks to the Jews about....
I don't think that there is anything wrong either with "quieter" services but I know when I think about Jesus it makes me shout with joy that he has saved me and brought me to salvation! I will get mad at you if you look me funny if I decide to praise... isn't that what we are here for (church, life) anyway, to praise and worship God all the day?
Oh yeah the butterflying in church is a no no!
Have a little more respect for the Lord than that!