Religious exemption from SS, FICA Tax Withholding from paycheck:
IRS Form 4029 – Application for Exemption From Social Security and Medicare Taxes and Waiver of Benefits.

They will keep taking out SS and FICA even after you go back to work after you are receiving your government SS retirement. Get out while you can and before the next "hair cut", like Cyprus had to go through.
Around 1996, the U.S. Military all had their retirements taken down from 60% to 40%. Hey, you were just there because you couldn't find a job right?? No worries, now get the F out NOW…that's why they call it "service", and enrollment is contracted 3-5 years at a time??.