In video sermons, the man railed against vaccines, “bad medicine” and doctors whom he deemed to be “priesthoods of the medical cult.”

And he explained why he refused to vaccinate his children, saying: “It didn’t seem smart to me that you would be saving people who weren’t the fittest. If evolution believes in survival of the fittest, well then why are we vaccinating everybody? Shouldn’t we just let the weak die off and let the strong survive?”

On a Facebook page matching his name and likeness, Seth Welch of Michigan spoke of his religious beliefs, which he shared with his wife, Tatiana Fusari. Those beliefs may have contributed to their own child’s death, according to court records.

Although the circumstances surrounding the baby’s death remain unclear, the couple were charged Monday with felony murder and first-degree child abuse after their nearly 10-month-old daughter, Mary, was found dead in her crib from malnutrition and dehydration, according to court records cited by NBC affiliate WOOD.