As the title states:
1. For those that are non-theists, including atheists, ignostics, agnostics, anti-theists, apatheists etc. etc., what is the single biggest obstacle for you in being a theist?
Non-cognitivism. And/Or the arbitrariness of the God concepts. It is a very basic, fundamental problem, which makes almost any argument for the existence of God fall flat.
2. If this biggest obstacle, question, complaint, etc. etc. could be addressed either partly or completely, is it rational to think that any other questions or obstacles, or complaints could be addressed that you may have which is hindering you from affirming the existence of God?
I am not sure if I understand you correctly here. If the non-cognitive nature of God could be addressed, could other complaints be addressed too? The way I see it, it is damned if you do, damned if you don't.
You are damned if you don't, because all the other popular arguments for the existence of God are meaningless. For instance, the fine-tuning argument can't ever be really successful until you can show how, if God exists, it is that the fine tuning constants are how they are. The same applies to all the very -- what I would call -- God-of-the-Gaps type of argumentation. This type of argumentation is too popular and rampant to be ignored.
And you are damned if you do address this obstacle, because you'd harm the (almost necessarily) mystical and incomprehensible nature of God. It would also cast severe doubts on what precisely the religious hoi polloi believes. Plus, it'd be arbitrary.
3. Is this obstacle, question, complaint volitional or intellectual in nature?
Definitely intellectual.
4. If God exists, do you think there would be evidence of His existence?
Hmmm ... I have no way to tell. Sure, I could say either "Yes" or "No" here, but that would be arbitrary.
5. If God exists, do you think He would reveal Himself to us or desire to have a relationship with us?
The same as above. I have no way to tell. Sure, I could say either "Yes" or "No" here, but that would be arbitrary.
6. What is your understanding of the concept "God"?
Despite the fact that non-cognitivism is a very basic problem to me, I do have certain requirements for "God":
In order for something to be God it must
1. be necessary being. Read, the fundamental parts of all existence.
2a. intelligent, conscious, a mind or something along those lines. In a meaningful sense.
2b. have libertarian free will.
Now, (1) is easy; there are definitely parts of all existence which are the most fundamental and necessary. This has never been a problem. With (2a) and (2b) non-cognitism comes to bear with full force. I consider (2b) even as impossible, incoherent in addition to meaningless.
7. If you were given sufficient evidence that Christianity were true, would you become a Christian?
Evidence has pretty little with all this^^^. The only hope is that I somehow cross over into mysticism, and/or just adapt "God" to my 'world-view'. (Keep in mind that there are different 'versions' of what it means to be a Christian.)