I'm sorry all of these things are happening to you at once. That is very stressful, and so frustrating. But, please do not worry about your soul based on what someone had in a jar. The things that have happened to your house and your rental house happen every day to people. Sometimes, unfortunately, all at once. Especially depending on the age of the houses. Kind of like an old car. All at once everything starts to fall apart.
And, having rental units can be a nightmare for anyone. At the advice of a friend, we screened our tenant VERY carefully. Better to wait another month and lose a month of rental income than have a tenant who will leave you with expensive damage. Get references and do credit checks. We had applicants who withdrew their applications just because we asked for an application with those things. And, we were not looking for perfection, either.
As far as the air in your home... think about the weather right now. How much have you been running the air this summer? Ours recently leaked, too, which my husband fixed. Sorry, but I can't tell you exactly how or use the proper terms for it, but it could be due simply to overuse right now. (I don't know one way or the other about the hot water line and how that might fit in.)
What I'm trying to say is that the problems you encountered with your tenant and the subsequent theft are common to renting. And, the problem you're encountering with your air conditioning is common in the summer. That's all. Continue to practice your religion in whatever way you have done so. Seek counsel from your minister if you feel you need it. Then, instead of focusing on the possibility that voodoo has cursed you try to spend that energy on researching better ways to screen your tenants. And, check with a plumber for a logical reason your air conditioning and hot water line have malfunctioned and what you and your husband can do in terms of maintenance to forestall future problems, which will inevitably arise. I think you will feel much better about everything when you regain a sense of control over these problems. We certainly can not control everything in our lives, but we can take an active part in managing our daily lives which can give us a certain peace of mind.
Coincidences happen all the time, and they are wonderful when they make us happy. But, PLEASE do not let these bad coincidences let you be swayed by some other person's belief in voodoo. IN MY OPINION, if there is any validity to it it is that evil people, whether under the guise of religion or simply a duplicitous secular friend, try to make good people feel bad about themselves. The father of a friend of mine used to say, "Don't let the turkeys get you down." Don't!