I know how you feel--I've been condemned to hell not only for reading Tarot cards, but for everything from having my own firm belief system to having several friends who are gay. (Apparently, not only is homosexuality a sin punishable by burning in hell for all eternity, but associating with them is enough for me to join them.) Also, I've had friends who have gone through serious issues regarding religion (always Christianity) whether it's inner struggles or being the victims of hate crimes. And yet they run around preaching love, acceptance, and forgiveness. Needless to say, I have a negative attitude towards organized religion.
This question has been asked before on this forum, and quotes from the bible have been provided if you look back far enough. I believe that Tarot is a pathway you can use to communicate directly to God. However, the Church doesn't like that--if you can get to God through means such as Tarot, then you don't need the Church, and that isn't good for business! So, they say it's evil, and everyone who practices Tarot burns in Hell. That should deter people from it and keep people coming to Church!
I've given up arguing. I used to get into passionate fights with fundamentalists both in and out of Churches (my hobby used to be going to Churches specifically to show people just how extreme their beliefs are), and it's never any use. After a certain point, they think they're right and EVERYBODY else is wrong and doomed to Hell. (Even though God loves and forgives them.) I used to try my best to show people that a loving God could never damn someone to Hell for ANY reason, but now I simply don't care. As long as people take comfort in their beliefs, whatever they may be, it's fine--God certainly doesn't care, because if He/She did, well, what kind of God would that be? And when they start to impose their beliefs on others, I'll ignore them or calmly bombard them with hard questions until it's simply too much to bear and I either explode or storm away.
I also had one interesting experience similar to yours--I was debating with someone on a blog online, and the person asked me to describe my beliefs. So, I did. My post was deleted because the person "did not want others visiting his site to think he held those beliefs." Why? Because those beliefs would supposedly earn him a one-way ticket to Hell.
Ultimately, it got too tiring to keep arguing. I used to hide my Tarot cards, but now I flaunt them. When people wonder how I always make such good choices or know what I do, they're quite shocked to know it's because I consult the cards. It's also a nice way to uncover people's dirty little secrets and surprise them...hehehe.
You'll always encounter people like that, not only by Christians, but by everyone--and not only because of Tarot, but because of everything. It's a lot easier to just accept that sad fact and move on.
Love always,
~Nicky
PS-sorry I started ranting...this subject always stirs up emotions in me! lol!