I do not personally see Atheism as ignorance. I see having a religion as ignorance. Atheism is using science, logic and reason to determine that a God is impossible, and a logical absurdity. Religion to me is just the idea that "Oh, I have a God and he's doing what he needs to do and doesn't tell me the reasoning or the purpose of things, I just have to go with it." Add in the fact that the Catholic Church was nothing more than greedy priests praying off people's insecurities and demanding money to gain salvation, and the whole organized religion does seem a bit... ignorant.
People who believe in God almost invariably do so because they were indoctrinated into the religious beliefs of their parents, before they were old enough to reason for themselves. This prevents them as adults from applying the same sort of logical reasoning to their religious beliefs that they do to almost all other aspects of their life.
When a person has believed something since childhood, and was never afforded the opportunity to learn that what they were taught is not actually true, they may tend to think of others who do not share their beliefs as "ignorant", when it ironically is the other way around.
Clumsical - "but in reality, they are both 100% opinion based, so for anyone to think that you can base ignorance on opinion makes them incredibly ignorant."
That is not the case. An opinion is a subjective truth. It has no truth value except for the person who holds the opinion.
The existence of God is an objective truth, not a subjective one. God either exists, or he doesn't, making the claim that God exists either a fact or a fallacy, not an opinion.
Atheism is not "opinion based" (nor is theism, for that matter). Atheism is based upon evidence. In this case, the complete lack of evidence where evidence would be expected warrants the logical conclusion that God does not exist.
Ashureta - "What sound more ignorant everything appeared magically after a "big bang", or there is actually a being above that created us."
They both sound equally ignorant.
Fortunately, no atheist thinks that "everything appeared magically after a big bang", and the fact that you *think* any atheist thinks this demonstrates *your* ignorance of the subject.
What sound more ignorant everything appeared magically after a "big bang", or there is actually a being above that created us. Just think about it, look at the world and everything in it and around it, everything turning out just perfect; if one little thing had been different we wouldn't have been able to exist. But not saying Christians and Catholics are perfect we all have our short Cummings.
People see any viewpoint with which they disagree as ignorant. It stems from the fact that people are supremely bad at accepting that they made the wrong choice at any point in the past, particularly with an issue as important as religion. Thus, the religious will always see atheists as ignorant and vice verse. Nothing short of a fundamental change to basis of humanity will change that fact.
Consider how ignorant you believe the religious to be. You see them as such because they reject your principles in favor of their own. Recognize that they see you in precisely the same way for precisely the same reason.
Because you can't prove or disprove religion with science, so it's all speculation. Of course, there is no real sense in arguing for something that science can't support, but arguing against it is just as futile.
There a verse that cuts through all that and says
Act 17:30 And the times of this ignorance God winked at; but now commander all men every where to repent:
Notice He "commander"....
Atheism is like saying article objects such as a computer or sports car can form form raw nature. Even time and Natural Selection aren't enough to explain the artificial appearance of the biological world.