[Mom MD]

Pfizer and Moderna had some early testing done on a cell line that had been around for a long time. Moderna actually grew its adenovirus in fetal cells and used them in the development, confirmation and production of the vaccine. (per your source) Many religious organizations identify the J and J vaccine as morally compromised over the other two.

[familyop]

"Moderna actually grew its adenovirus in fetal cells and used them in the development, confirmation and production of the vaccine. (per your source)"

Typo, maybe? The answer from Nebraska Medicine (Lawler, MD) said the same about Johnson & Johnson but confirmation tests only for Moderna and Pfizer. "...neither the Pfizer nor Moderna vaccines used fetal cell lines during the development or production phases...However, both companies used the fetal cell line HEK 293 in the confirmation phase to ensure the vaccines work." Anyway, I respect choices of individuals based on religious beliefs in regards to the vaccine.