The early Greeks logically deduced that the universe needed to have what they called an "uncaused cause," meaning a creator. They came up with the idea that there had to be a God to start it all, and there could only be one God. You might enjoy reading some of their articles. I believe Socrates and Plato and Aristotle all contributed.
What the Greek philosophers were not able to accomplish was to actually get to know this One God in a personal way. God would need to reveal Himself personally, and He did... to the ancient Hebrew people. In a similar way, He has to reveal Himself to people today, but He has made it easier. We can get to know Him through His Church and through His Word.
People who become believers in God after being atheists or agnostics do not usually get there because they one day encountered the ironclad logical argument that laid their questions and doubts to rest. It usually happens because they had a real encounter with the real God; that encounter can be subtle and progressive, or very dramatic. At that point no one can talk them out of what they know experientially to be true.
Here's an example of a formerly atheist blogger who recently converted to Catholicism. She is extremely articulate: http://americamagazine.org/content/all-things/my-journey-atheist-catholic-11-questions-leah-libresco
An uncaused cause has not been reasoned though. It is nothing more than special pleading. A formal logical fallacy plain and simple. If there is such a thing as an uncaused cause then your premise of cause and effect is destroyed. Now if for a second we say that an uncaused cause is logical and justified. That doesn't get us to conscious deity that intervenes in human affairs.
There are clergy that become atheists too. The sword swings both ways. It doesn't validate either point. Personal experience isn't reasonable evidence either. So again we are back at agnostic atheism as being the only reasonable stance.
"Now if for a second we say that an uncaused cause is logical and justified. That doesn't get us to conscious deity that intervenes in human affairs."
You're right; it doesn't. For that, you need revelation--the Deity to condescend to reveal Himself personally to you.
Like I said above, you won't come to faith in God through logical arguments. However, I do hope and pray that you do come to faith in Him. You may not believe in Him yet, but be assured that He believes in you and loves you.
"Like I said above, you won't come to faith in God through logical arguments."
Yea, that pretty much sums up the topic. I just don't see a logical road to god. I also recognize that god hasn't been and quite possibly can't be disproved. I dunno!