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Obviously you can 'believe' whatever you like but unfortunately the efficacy of prayer has been shown to be zero when tested empirically with all the proper controls. It's as useful as wishing for the tooth fairy to give you money for your teeth.
Prayer it seems, is just well meaning wishful thinking. Ineffective though it may be in influencing a hypothetical creator deity to intervene in human affairs, it is nevertheless useful in helping people who believe in such things feel good about themselves and others. In that regard, prayer is a harmless psychological crutch.