Why do I call it faith?  
Simple:  Atheism fosters the rejection of the existence of a deity without empirical proof just like theists foster the existence of a deity without supposed empirical proof.  Each respectively uses faith to support their ideas.  
When an atheist is questioned about God, their answer is the typically programmed one:  the burden of proof rests on you.  This is a cowardly way out of engaging in a rational debate.  If only one side presents the case, then how can there be a fair discussion if a discussion needs two sides?
The burden of proof lies on both: the one denying God and the one defending God.  After both sides are given, then a conclusion can come about.  
On Twitter when Atheists message me with nonsensical tweets, I laugh and in my mind hear their silly tweets like this: