Actually, not saying such a thing would have a more negative effect on our relationship. If you don't say what I know is on your mind, I will feel you are being disingenuous. I can deal with frank and honest provided there is a degree of courtesy and respect. You would receive the same in return.
I am happy to report that I have never had a theological discussion with a Mormon which has ended or even lessened our friendship. I said some awfully harsh things against their LDS Church but they realized that I wasn't personally criticizing them.
I agree that having the conversation would be good, I was merely saying that spouting off conlcusions like you did “while I loath mormonism” isn’t helpful or constructive in any way. It doesn’t add to anyone’s understanding nor does it educate. Basically, no good could come from making such comments. That’s why I would not say such things about your faith. I would however, be interested in learning about your beliefs and also taking about mine.