sensitive-compartmented-information
"It makes sense that you are from a different planet and would not be familiar with our categorization scheme. Human minds are not well-equipped to handle many Activities, Concepts, and Experiences that human science currently struggles to understand. This centrally includes all magic, observing some entities in various states, exposure to certain works of art, and certain explanations of facts about the broader nature of the universe and the species within it. Witnessing magic is not particularly likely to cause serious harm, but using it or studying it generally will. It is possible that the magic that you have access to operates differently, but our commission will be very skeptical of such a claim: there have been many sorcerers who insisted that they had some technique such that they were unharmed, and they have a higher murder and suicide rate than average, at least of those we track. Iomedae is what we would call a mythos entity, though from what you have said it seems she is a relatively benign one, and if you were summon any servants of hers that would also count."
"If you have a conversation with me or Caiden to convey basic facts about Iomedae, that is permissible. If you try to convince others to worship her, speak about how others may worship her, or do the equivalent for performing rituals of her, sacrifices to her, or similar, that is not permissible without permission. You're an unusual case," like most of them" so some of our normal rules and regulations aren't going to fit you quite smoothly, but we can do our best to work through the process together. Once that's done you'll be eligible to get your book back, and the Boston Police Department will be authorized to ask your for assistance and offer payment for consulting services, same as they are allowed to do with other Authorized Mythos Institutions. You're not just restricted to working with them, of course: Miskatonic would almost certainly pay handsomely for spellcasting. Working in a hospital might not be viable, so stabilizing the actively dying will not be of much use, but curing blindness would be very helpful to many people and would be legal activity."
"Since it seems like you want to begin..."
She takes out her laptop and starts filling in the form. "You're the only member of your church in Massachusetts that you are certain of, yes?"