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No, although it could get complicated. Assuming there are financial statements that illustrate where the money to develope the church has been generated, the property should belong to the church membership or body.
You should look to have this legally settled however before things get out of hand, i.e., he changes the locks. Your search about fiduciary duties was appropriate. Furthermore, he would be in breach of his fiduciary duty if he were to take such actions. He has signed the deed as a real person in being. A corporation cannot sign, it has to have an agent do so. He and the other trustees were the agents acting on behalf of the church.