The Trinity is a selfish, cowardly, and irresponsible theory.
The secondary belief in Trinity is that Jesus died for your sins and therefore saved humanity. Well, all you have to do to have EVERY SINGLE SIN redeemed is to believe that he died for you. This is a blantant lack of responsibility [which has become quite an epidemic in the U.S. See the McDonalds lawsuits] and unwillingness to TAKE responsibility for your actions. This is why I believe that so many Christians behave in a disrespectful manner and still do that which is forbidden. Their theory is that Jesus' blood is their ticket in, so since they are going to Heaven, they can do whatever they want!
It is selfish because they forget about the people BEFORE Jesus! What about them? They never even knew about Jesus or that he would be sacrificed! Therefore, according to the Trinity Doctorine, all those that came before Jesus are all screwed, because they never believed in him.
The Trinity is also very cowardly, in people thinking that God needs a mediator between Him and humans. If that was true, then why did God command the Jews to worship only Him, the Creator? Jesus didn't create the earth, so he is not the Creator. People who believe in the Trinity are to afraid to accept responsibility for their bad deeds, so they think that they can make themselves feel better by praying to Jesus to cleanse them.
So, I conclude that the Trinity is a selfish, irresponsible, and cowardly belief.