You're completely missing the point. The subject of the feeling, ie God or your girlfriend, is immaterial. The issue is the individuals feeling/emotion i.e. love, inner freedom, whatever. That is a personal and subjective emotion.
If I met your girlfriend and concluded that nobody in their right mind could love her (I'm not saying that, no doubt she's lovely) it doesn't alter that you have every right to feel love for he, and nobody can or should doubt what you feel.
Ditto if you don't believe in the God that Raging Bull does, it doesn't matter that he has a right to believe in that God and to feel certain emotions/feelings accordingly.
The issue here is your erroneous belief that Raging Bull, or anyone else, cannot possibly have feelings or emoticons about something that it is intangible and/or you do not believe in.