Hard Evidence of the Existence of God

Thanks to modern science we have many miracles about our faith that are fascinating, including the burial cloths of Jesus and Eucharistic Miracles that include His blood type and DNA. Can the same blood type and DNA of Eucharistic miracles and burial cloths that are separated by hundreds of years actually match? St. Carlo Acutis and other Saints have bodies on public display that are in some cases hundreds of years old and have NOT decomposed. How is this possible?