Religious experience is reported across all religions with contradictory content. If a sensus divinitatis produces Hindu, Muslim, and Christian beliefs, it isn’t reliably tracking truth, and Plantinga’s own reliability criterion sinks it.

This is the objection from religious diversity and it is the most serious challenge to Reformed epistemology. Plantinga’s response is that the sensus divinitatis produces the basic belief in a God or transcendent reality, which is widespread, while specific doctrinal beliefs come through additional means (for the Christian, the Holy Spirit’s testimony to Scripture). Critics reply that this only relocates the problem. The claim survives in a weakened form: the charge of irrationality still requires an argument about truth, but the diversity of religious experience is itself part of the evidence to be weighed.