Mihkel,
The Catholic Church has no official opinion on it and it is unlikely that it will make a judgment, but if it did, it would not lend credence to its claims of being inspired and would probably consider Davis's communications from God as not of supernatural origin.
According to Wikipedia Davis seems to have bipolar disorder and these thoughts of being ultra-religious and, being convinced that one has supernatural communications from God, are common among people with bipolar disorder.
Eric
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