Terms are useful, because they help categorize ideas in our head. Post-modernists detest labels because they do not appreciate being bound or trapped within these labels. I have heard these arguments extended to abolish labels. This is going too far. However, the kritik is well taken. Labels are restrictive at times, and so I will refrain from lending them as much trust as I put in axioms.
I am an orthodox christian. I believe in the one true God. He is the father, the son and the holy spirit. The son is both fully human and fully divine without confusion, without separation and without alteration. Some sects of what is called "liberal" christianity deny some or part of these propositions. Liberal in this sense denotes a loose interpretation of the bible. Loose being a more lucid term, I will use it more as a referent.
Some loose christians positively affirm their belief in Kristos, but do not deny the existence of other gods. I used to think that this was a passive form of atheism via pluralism. Introduction to new terms has helped me to understand that this not some fresh development in thought. It is as an idea as old as the pentateuch. It is idolatry, it is wagering and it is false doctrine.
Monotheists say there is one God and only one God. Henotheists kneel and pray to one God, but do not rebuke others' deities. This comes from a polytheistic era where pagans prayed to their local deities , thinking that different jurisdictions were the dominion of different deities. These humans sought a higher power for guidance, but did not believe that their higher power was alone able to aid them. The concept of one being with jurisdiction over all of creation is a radical idea. It is Christianity. Submit wisely.
Post Scriptum: Special thanks to the orthodox wiki.