"Please explain to me why not believing in god is considered ignorant? If you have no tangible proof to go on what is the basis of my faith? Because some books said it's so? Or some guy on an altar tells me so? Sounds very weak to me..."
To say that there is no God is just plain ignorance. It takes no thought whatsoever. There are three proofs that God is exists.
Here goes one proof:
God is defined as the greatest conceivable being. God is the being than which none greater can be conceived. Now let's use paintings as our analogy.
Painting A:exists only in the mind
Painting B:exists in the mind and also in reality
Now atheists belive in Painting A that God or the painting only exists in the mind. But if you believe in the definition of God, which you cannot refute, then you have to believe in painting B. This is a thousand year old proof that best proves that God exists.