Check out applied kinesiology / muscle testing -- with this tool you can find out the answer to any question you have. Many people are already using it to do actual spiritual research, including many spiritual teachers and authors.
And the thing is, it doesn't require any background at all. You can just go right into it and find out whatever you want. The only possible disadvantage is that it takes quite some practice to master and get accurate results -- one has to learn to phrase the right questions and become 100% nonattached to the outcome, interested only in finding the truth and not to prove a positionality.
Dr. Hawkins has researched and used this technique in depth in "Power vs. Force" which you've probably heard about or read already.
It's not an actual career or science per se, but it will probably prove very useful no matter which field or direction you choose to go into.
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