Hot damn this thread is hot. How do you lower-boarders manage all these posts?
I'll weigh in with my opinions, 'cause I see a lot of misunderstanding going around; at least, misunderstanding according to Catholic theology.
(NB: not all my views are consistent with the general Catholic consensus. I maintain that they do not constitute heresy, however)
The primary problem I see is a very limited view of God. Let's get one thing straight: whatever He is (I use the accepted pronoun for convenience), God is not the elderly-gentleman-with-a-penchant-for-violent-rage as he seems to be portrayed here. I am genuinely surprised that this thread has gone on for ten pages and not a single person has mentioned the Trinity - you know, only the defining belief for all Christianity? That just tells me how ill-informed people are.
The "Old Man God" view (which I'm calling Exotheism) views God as "outside" Creation: imagine Creation as big circle, and God is outside that circle. This is absolutely anathema to a my understanding of God. God is not separate from Creation; in fact, all Creation - that is, everything - is inside of God, and He inside of everything. This is not Pantheism, either: in pantheism, God is a function of the universe - if you took away the universe, God would disappear as well. My view is Panentheism, in which God at once transcends and pervades Creation. St. Bonaventure describes God as "an intelligible sphere, the center of which is everywhere, and the circumference is nowhere."
To show the nuance of this God: we must, to be as correct as possible, say that God doesn't exist. That doesn't mean He's not real - in fact, He is the Ultimate Reality - but "existence" as we comprehend it is not a property of God. It would be more correct (though not perfectly so) to say that He is existence itself.
Now this God, who is ever-beyond and yet ever-present, is also not a single entity, but comprises three Persons in one Divine Essence (I'm using the standard diction for these things, sorry if it sounds so esoteric): Father, Son, and Holy Spirit. The Trinity is the mystery of the Church - it defies our comprehension (though not necessarily our reason). However, to the best of our abilities we have tried, if not to explain, at least to illuminate the matter. The most common expression builds off the "God is Love" statement from St. Paul (I think?): the Father is the Lover, the Son the Beloved, and the Holy Spirit the Love between them. The important thing, for the moment, is that God is not an individual being, but a community of persons (NOTE: NOT three gods, but three Persons in one God).
Long story short, and very much boiled-down, God comprises everything. He is the source of everything, the existence of everything, and the end goal of everything. Anything which is not God (i.e. sin) is in fact nothingness, a lack of actual "stuff," like darkness is the absence of light. As such, God does not make arbitrary decrees for humans to follow; nor is it entirely true that He has ordered the universe in any certain way - rather, the universe is ordered (according to natural laws of physics as much as moral laws) because those laws reflect the nature of God, not because God arbitrarily decreed the existence of gravity. Certain actions are sinful, not because they break some irrational law of a bearded sky-man, but because they are a turning-away from God (and by extension, the natural order).
Whew. I apologize for the befuddling and grossly insufficient effort to explain my position (there's a reason St. Augustine needed six hundred pages of Latin to talk about just the Trinity). If you want to know more about this or its implications, I'll be happy to oblige, but it's all pretty complex: religion isn't just a table of beliefs but a web of principles and consequences, all of which are so interrelated that talking about one demands that you explain another. I really just wanted people to understand that there's a whole hell of a lot more to God than anyone has mentioned (speaking of which, I haven't even touched on hell. Shit).
Oh, I might as well weigh in on homosexuality too: I believe the Catholic position has been given, if not here then somewhere else on the fora. I only say that I agree with a certain pope - the current buzz over homosexuality is way overblown (mostly, I think, to long-held culture taboos more than religious beliefs) and that things like divorce pose a much, much, much greater threat to the sanctity of marriage than gay couples or Yankee liberals.