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That's absolutely not disrespectful!

Now, I didn't come from that viewpoint; I came from the esoteric viewpoint. But that doesn't mean others' views are less or more valid because of that. There's many reasons why we come to the Tarot and other divination techniques. At the root of them all, is the want to help people.

I would believe, as long as you do not misrepresent yourself, and explain how you read, it would not be disrespectful. Now, offensive... There's so many people, that you will not any choice someone doesn't find "offensive". Even not making a choice (which is usually a choice) can be viewed as "offensive". So for those people, well,... eloquently, fuck them.

I would recommend a deck, either the venerable Rider-Waite-Smith (loads of Christian symbolism). If you're into learning and research how the deck works, RWS is exceptionally cited and a perfect teaching instrument. It's also the deck that everybody has either seen or knows.

Or I would try out the Jungian Tarot. If you are familiar with Carl Jung, this seems to be a deck working with his researched archetypes in psychology. This may be more in the direction of what you want.

Or you could try Osho Zen tarot. It's technically a tarot deck, but acts like an oracle deck. It's weird, but scarily effective. But it delves into the human condition like nothing I've ever seen.

I buy from Amazon. I like the Rider-Waite-Colman deck. As you'll see, it comes in many flavors:

http://www.amazon.com/s/ref=nb_sb_ss_c_0_12?url=search-alias%3Daps&field-keywords=rider+waite+tarot+deck&sprefix=rider+waite+%2Caps%2C220&rh=i%3Aaps%2Ck%3Arider+waite+tarot+deck

I recommend Dusty White's book, it really makes you interact with the cards and rely on your intuition to pull the meanings together. I believe he recommends that you also buy the jumbo-sized deck so you can really see the images.

http://www.amazon.com/The-Easiest-Way-Learn-Tarot/dp/1419692887

Joan Bunning offers a free class online. She also has a book.
http://www.learntarot.com/

There are numerous resources. I suggest you start with these to keep from getting overwhelmed. You're lucky to have a roommate with whom you can learn.

Amazon

"The Easiest Way to Learn the Tarot - Ever!!"

Here is the mobile version of your link