2) One who uses the trappings of a Christian believer to attain something he otherwise couldn't (ie a Christian music leader claiming faith in Christ so he can join the Christian music group and gain a level of respect)
3) a heretic (ie the early Gnostics saw themselves as Christian though they're belifs had no consistency with universally accepted Christian doctrine as outlined in the scriptures and the Nicene Creed (which all Christians Catholic, Protestant, Orthodox, American Evangelicals etc accept).
2) second type: Jim Jones or other cult leaders or people who use the Church to advance in position not because they want to advance the Christian message. Such leaders say they are christian but their acts and beliefs reveal they are Pseudo-Christian.
3) the third type: the Christian Pagan groups which say you can worship God of the bible and ancient gods (like Zeus or Thor etc) but insist on calling themselves "Christian". Christianity is one of the three great monothestic religions and thus you cannot be a "Christian" if you believe in other gods (ancient or otherwise). These people reveal by their beliefs that they are Psuedo-Christian though their actions might be benign.