Having been vaccinated in the past does not preclude you from requesting a religious exemption to COVID vaccine requirements, but you may need to explain any inconsistencies, differentiate COVID vaccines from other vaccines you’ve had in the past or explain why your views — based on your sincerely held religious beliefs — have changed.
Citing the following guidance in your request from the Equal Employment Opportunity Commission might be helpful:
“Although prior inconsistent conduct is relevant to the question of sincerity, an individual’s beliefs — or degree of adherence — may change over time, and therefore an employee’s newly adopted or inconsistently observed religious practice may nevertheless be sincerely held.”
Please check out The Vault Project’s religious exemption section for further guidance and examples of how to respond to this question in more depth.