There are many people from all different confessions that view tarot as a superstition. And they often get very agitated about it.
I find this useful:
If you yourself like to read an think a lot. read christian mysticians lika Eckart, Cusanus, etc that emphasise the "search for truth". Thát the realm of God is fundamentally different from the realm of Man in that we cannot grasp truth entirely. We can only from reading the book of nature and The Book (The Bible) approach truth. The tarot is one way to aid us humans in this search for truth! Theologically the Christian mystics are a good argument.
But I suppose that many people just come up with some quote about babylonian fortunetellers from the Old Testament, or such, and ban it as the work of the devil.
Can you describe the arguments you are meeting against tarot?