<p>If you don't want to put agnostic, then leave it blank. Putting non-denominational is saying that you are a Christian but do not stick to one denomination (i.e. Baptist, Methodist)</p>
<p>From what I've heard and based on personal experience, I'm almost positive that not being Catholic doesn't hurt you. I put "none" and I got in if that helps you at all.</p>
<p>I also have a question about religious affiliation. I am half-Jewish, half-Protestant (I think). However, I was never really raised in either religion and never went to church, temple, etc. I celebrate Christmas/Easter but also Hanukkah/Passover, etc. Would it be wrong to put Jewish down? Should I just leave it blank?</p>
<p>If I remember correctly, the race and religion questions on the application are optional, and I left both of them blank, and still got in. I don't think it has a huge effect on your chances, especially if you have a strong application anyways. I'd say just leave it blank if you have any doubts about what you would call your religious background.</p>