1) If you read the gospels, you'll find that even people who witnessed the miracles Jesus performed quite simply weren't satisfied with that evidence. If a person doesn't want to believe, and/or their heart is hardened, no amount of evidence will convince them. Even if God Himself came down from heaven and showed Himself to everyone, there would be many who would immediately begin making excuses for why it couldn't possibly be evidence.
2) God has only spoken to me once, and in that case, it was a voice that went straight through me. Beyond that, it's hard to describe how I "hear" God. It isn't a voice. Most of the time, there aren't clear words. But it's God, just the same. I can't even explain to you how I know, but I do. It's like an ever-present inaudible whisper.
3) Heaven and hell both exist on different planes. They won't be found anywhere on the Earth, or in the universe. It's only possible to reach them if you're dead.
4) You're missing the point of the story. If you take it too literal, you miss the lesson that it's supposed to teach. If you take it only as figurative, you miss the awesomeness of God's power. The point of Noah's ark was to show that if God was to destroy all evil, it would require destroying all life. Obviously, since evil returned within one generation, we live in a fallen world, and only a world devoid of life will also be devoid of sin. You see? So it doesn't matter whether or not Noah really lived, and really built an ark, and there really was a world-wide flood, et cetera. Maybe it happened, maybe it didn't. If God exists, there's no reason why it couldn't have. But that doesn't mean it did. You have to decide for yourself if it happened or not. If it didn't, that doesn't mean that God doesn't exist, nor does it mean the Bible is only fiction.
5) Not all Christians are creationists. I accept evolution, and believe that was the design God used to create.
6) Everyone has been through some real crap in their lives. I have, and I struggled with suicidal thoughts too. The conclusion I came to was that the reason God didn't swoop in and save the day is because first, He never promised life would be easy. In fact, He promised the exact opposite. Second, I had to learn to stand on my own. And, the fact that I'm still alive says to me that God WAS preserving me and strengthening me all along. It's when I look back that I see God's hand evident throughout my life. At the time, though, it was really hard to see.
7) I have no idea, but what does it have to do with anything?
8) I don't know about that. It's irrelevant though. So scientists say the entire Earth was once covered with water, eh? You sure? Because you know, the Bible says the same thing. Check out Genesis. God separated the waters from the waters (hydrological cycle), then separated (or created) land from the waters. Huh.
9) I don't know. No one does. However, in the NT (I think it's in 1 Peter but it might be in 2 Peter) it says that in the last days, men will start to doubt Jesus' return, and mock it, saying that it's been such a long time. But the author goes on to say that a thousand years is like a day to the Lord, so really, Jesus hasn't been gone long at all. Only a couple days.
10) I first started believing in God when He spoke to me. I'd never heard anything like it, and I've never heard anything like it since. However, whenever I've had conversations with others who also have heard God's voice, they describe the experience exactly the same as me.
You can email me through here, and I'll try to answer you.