To carry out a confirmatory experiment one that would leave no possibility of an alternative explanation the investigators would have to produce evidence of an effect that could only be explainable by a force unknown to science, such as the intervention of a deity or its agent. There are some outcomes that could eliminate most doubt about experimental artifacts and they would have to involve dependent variables that could not occur except by divine intervention. Investigators would have to identify a dependent variable that could withstand the lemon test, one that would yield clearcut results. There are such variables.
For example, one very simple experiment, the results of which would leave little or no doubt about the effectiveness of intercessory prayer, could involve the regeneration of an amputated limb.
[9] All that would be required is an adequate sample of amputees as subjects and a sizeable number of believers who will earnestly pray over them. These should not be hard to locate. The investigators could use as many universities and people as possible all the willing believers in the country if necessary to pray every day for a year that at least one amputee would have a limb re-grown, and then, at the end of that year, examine all the thousands of amputees for signs of regenerating limbs.
Any amputee who wants to be included in the experimental group would be examined beforehand by a panel of physicians to ascertain that he or she is indeed an amputee. DNA samples on the subjects would be taken before and after the study to ascertain that the amputee identified at the beginning would indeed actually be the person who was examined a year later. There would be no limit on the sample size. No need for randomization,
t tests, analyses of variance, factor analyses, significance levels, or confidence intervals. The subjects would present themselves at the end of the year and be examined to see if a single missing limb had been restored. Any priest, minister, rabbi, or lay person would be permitted to recommend subjects for the experiment, and any could observe the examination for the regenerated limbs. There should be no limitation on the number of amputees, people who pray for them, and observers to keep everything organized and uncontaminated.
When a single limb has thus been observed to have been regenerated, then we will have seen unequivocal evidence for the power of prayer. This would be a real test to put before the immovable object; the irresistible force; the ultimate omniscience, the omnipotent, omnipresent supremacy of all that the believers in a supernatural being endow that Master Architect with. The creator of the entire universe should have no problem re-creating a limb.