Hi Sunray,
I was moved to replie. You asked "How can they tell, but I can't? " It might have been the way you spoke or acted during the ritual? I'm just guessing. Maybe in your heart you don't feel like a mystic. So that is why you can't see it. Or it might not be the time in your life. When it is to be, you will see whatever it is to be.
"Would my religious upbringing be supressing that?" In my case I found that my religious upbringing was supressing my spirit. So that the free flow was a bit restricted. Although I was taught one way, in my heart I felt drawn to another path. And I would find myself doubting myself. Does this make sense?
In the end you are what you choose. And I truly believe that we all have the the gifts. Some are just still waiting to be unwrapped.

Best of luck!
Safe Journey
Crow