All religious belief is unsupported by objective evidence. Religious people who believe in divine intervention usually claim that their prayers are answered by God. Since physics tells us that the Laws of nature are regular and fixed and if they were subject to intervention by a God (miracle?), we would expect dramatic effects within our reality. Science has never confirmed any such event and since such would be an extraordinary event requiring extraordinary evidence, it is reasonable to conclude that prayer effects are most likely the result of the fallacy of Post Hoc Ergo Propter (After this, therefore because of this): correlation interpreted as causation. Regarding the claims of medical miracles, the realities of spontaneous remission and unusual events are ignored.
