Athiest or Agnostic?

I was on a discussion forum where the topic was atheism, and they were basically complaining that Christians need to stop talking to others about God and not bother those who don't think there is a God, or don't want to worship Him. But one topic made me think; a Christian on the forum wrote that you cannot know absolutely anything, you can't. If you did you would know every thought of every person ever born; you would know the amount of sand on all the beaches on this Earth, you would know all. Well, since humans can't know everything then you can't know for a fact that there is no God, and because of this, it suggests that atheism is false, and impossible, atheists are really agnostics. Atheists believe that there is no God, and agnostics believe that there isn't sufficient proof to support there being a God or not. But an atheist argued that: "well, you cannot know for a fact that there is a God." My conclusion to this person is that they're wrong. There is sufficient evidence that supports a God, and not enough for there not to be a God. Look at it this way, how does the court prosecutor know whether or not the defendant is innocent or guilty since they weren't there at the crime? They're basing their case on evidence that suggests that the defendant is guilty, whether or not there is a witness or not. The courts ask for the jury to make a decision based on the evidence at hand, so it's up to the jury to believe that evidence. Sadly we are the jury who has put God on trial, except that God is innocent and wrongly accused. This can also be said for Christ Jesus being that God; there is enough evidence including witness testimony that there isn't only just a God, but he is Jesus Christ. To deny God is to deny the evidence, unless you don't believe the evidence and then you are a fool. I honestly believe that everyone believes in God, but due to sin they deny Him and his existence. I feel sad for these people because they are missing out on His Joy, Peace, and Majesty. And I am even sadder to think that when they leave this Earth they will be permanently separated from God, which is the worst thing ever.