Sorry you are going through all this with your Dad. Unfortunately, many people let their own prejudices, likes and dislikes get in the way of meaningful discussions and relationships.
What I love about what you write is that you are obviously happy and confident with who you are. Lots of people never get to that point. Never lose that. People who are true friends and who love you won't impose their own beliefs on you - they may not agree with you but they accept that you have the same right to your beliefs as they.
As a (as of today) 61 year old, and president of a small college, I get lots of my staff, faculty and students wanting to know if my tattoo is real or not. They want to see it to be convinced. The reaction has been overwhelmingly positive. I was at an event last evening out in the community and I had several people asking, again, if I really did it or if it was fake. Too funny. My wife just rolls her eyes and smiles.