IT definitly matters. Look, its not that i specificly don't want to believe in god. I want to know the truth, and as far as i can tell, christianity is not it. So i want to rule that out of my options of possible truths. But, i want of course christians oppinion on on my arguments against it, because maybe i just got something wrong. Thats why i think it matters very much.
So, i don't believe in neither evil (as a divine thingy), an all-might/knowing god, and a true love and good god. But christians do, and i, as many others, see this as a self-contradiction, whereas we rule christianity out as a possible truth. So it matter because through it, i can rule out christianity (from my point of view).