Atheism does lack imagination. It's basically in the same category as theism (of the most literal, strict sort, i.e, those that posit the existence of a supreme yet finite being).
Both are ridiculous because neither understand that God is a word that is a catch all for transcendent/immanent order, beauty, majesty, and the endless unfolding/display of these principles. God is is a word of awe. It's the symbol and vocalization of the realization of the immediate, in-your-face presence of an excellent and terrible mystery that by its very nature can not and does not need to be solved, but nevertheless invites our unending participation. To be authentically religious is to understand this intuitively and to recognize that the object of awe/reverance (God) is not only real, but that it and you are of the same 'substance' - that you enjoy an intimate relationship with it.