Posted a reply - don't know quite what has happened to it!
ISTM that fundamentalists tend to say - "I am doing this to try to bring you to faith in my religion/denomination because I know that my denomination has the RIGHT answer and if you don't believe as I do you will go to hell", whereas the liberal would be thinking "I am doing this because I believe it is the right thing to do. I hope that my actions will lead you by example to the same belief, but if not it is still right for me to do this".
Having said that I have come across a quite cohesive argument for the existence of fundamentalist liberals...., also the meaning of the labels has changed over the last 100 yrs or so!