If you're an employee of a company that offers a SEP IRA, your contributions count toward your traditional IRA contribution limit rather than the limit for defined contribution plans. For example, as of 2013, you can contribute up to $6,500 if you're 50 or older, or $5,500 if you're younger than 50.
Definition of skepticism 1: an attitude of doubt or a disposition to incredulity either in general or toward a particular object 2 a: the doctrine that true knowledge or knowledge in a particular area is uncertain
An agnostic is one who believes it impossible to know anything about God or about the creation of the universe and refrains from commitment to any religious doctrine. An atheist is one who denies the existence of a deity or of divine beings.