I am an Atheist, and I am happy to answer these questions. Please understand that applying sweeping generalizations and stereotypes to certain groups of people is rather hypocritical. When you ask for someone else's perspective, I expect that you will try to actually consider it from their perspective. Therefore, this answer is from the Atheist perspective and not as a truth.
Most Atheists do not get mad at God, Anymore than we get mad at Santa Claus. What I think you might be referring to is why a lot of Athiests seem "Angry" and this is true. A lot of them are Angry, not at God, but rather at the people who
they feel have told them lies. Again, I'm not saying that you are living a lie, not at all, but this is from an Atheist perspective. A lot of Atheists were once theists. We were told things as truths that we now consider to be false. Imagine how you felt when you learned that your parents lied to you about Santa?
We don't blame God for anything. Again, we do not think there is enough evidence to conclude that: 1) God exists; and 2) that a supernatural being cares who you go to bed with, and on what day, and on what day you work, and what day you don't, and whether you lie, etc. Again, a lot of us came from a belief system, and we eventually we unable to square the circle, so to speak. For example, I was on a plane with a woman and we were discussing plane crashes (nice, right?) and we were discussing a recent plane crash where the skilled pilot was able to corkscrew down from the sky on one engine and no hydraulics. 110 people died in the crash, but 280 people survived. She turned to me and said, "Its a miracle that the pilot was on the plane. Thank you Jesus." And that, right there, is what I'm talking about when I say squaring the circle. See, she looked at the situation where 110 people lost their lives, and saw God's hand in that as being kind. Atheists would see God as culpable. So its not that we actually blame God for everything, we blame the idea of God interfering in our lives.
We can tolerate other religious views. In terms of theism/atheism, we atheists are outnumbered. We deal with religion every day in our lives. We don't believe us as superior anymore than a fundamentalist believes themselves "holier than thou"
I think you have a misunderstanding of the word "theory" as it relates to science. A theory is not a theory in the same context as everyday speak. A scientific theory is a hypothesis that has been proven. Evolution Theory doesn't say that we evolved from monkeys. Nay nay. Evolution states we have common ancestry with primates. Remember, a monkey is a primate, but not all primates are monkeys. Apes, Chimps, gorillas, etc., are all primates and they are, effectively, our cousins. We even share the similar DNA to plants. Its beautiful really, it means that every living thing on this planet is intricately connected.
Again, words have precise meaning in science. Outside of science, you might say something is 'just a theory', meaning it's supposition that may or may not be true. In science, a theory is an explanation that generally is accepted to be true.
A hypothesis is an educated guess, based on observation. Usually, a hypothesis can be supported or refuted through experimentation or more observation.
A scientific
theory summarizes a hypothesis or group of hypotheses that have been supported with repeated testing. A theory is valid as long as there is no evidence to dispute it.
Please understand that you do know what its like to be an Atheist regarding Zeus, Apollo, Horus, Dionesis, and about a thousand other Gods that you don't believe in. The only difference between you and me, is that I took it one god further. I'm not wrong for my views, as you are not wrong for yours. Surely you can appreciate that there is mud slinging on both sides.
I hope this answers your questions.