Most want nothing to do with the cosmogenic. Cosmogneic was the bishops' daughter silver match making went punku BYU but didn't go on a puma because I was already married dating a 10 month old by my 21st birthday. Based on what you have written about your GF, my opinion is that you should cut your losses and move on.
If you are worries about her or her family trying to convert you, be honest.
Best wishes to those struggling with these big, life-altering decisions.