I feel that no matter what religion you are, if you are comfortable using the Tarot, and blending it with your beliefs, then it is the right way to go. I'm pretty sure one's God/s will be pleased for knowing one is trying to gain wisdom, knowledge, and experience in such an enriching way: Not only does the Tarot offer these, but you can use it to help others and offer guidance in times of pain. And don't most religions teach that this is a virtue? Being a guide and helping hand for somebody (See the parable of the Good Samaritan) is what a religious belief system is all about, isn't it?
There are many ways in which we can enrich our lives. The way we view those methods all depends on how we have been bought up to think. Maybe by using the Tarot aswell as being Roman Catholic, you can create awareness about it. It only takes one good person to show that using the Tarot does not mean you are evil or Satanic. I know you're a good person cuz you wouldn't be askig questions like this if you weren't.
As for Christianity's views on divination, I don't know much, I'm not Christian. However, I do know that King Sol visited a diviner to eithe rprotect himself or his son I'm not sure which one. There are many references to John the Baptist being 'that way inclined' towards divination... But only in the Apocrypha. I can also speak from the side of the Tarot and it's many gifts....
Looking into the furture and counselling yourslef of your problems doesn't always have to be the work of the Gods. Maybe we need a little assistance when trying desperately to understand what They (Whichever Divine Being you believe in) want u to do in life, and what They are trying to tell us. The Tarot can do that I think.
Anyway, I have babbled on for far too long on a question I can only really answer half of. Hope my rambles helped some.
Kiama