The real world is always very messy, and a fake vaccine certificate would probably “get by” in some situations and not others...
I told my wife she would definitely have to get one because she works at CVS—I am almost certain CVS would consider it a condition of employment and would fully enforce it.
Get a vaccine, not a fake certificate... :-)
If the vaccine used aborted babies in the development, then there might be a religious objection that might be valid in some states and worthy of a court challenge federally.
It's been that way for a long time. I know my mom couldn't enroll me in school in the 1970's without me having my vaccine records up to date. They didn't "force" me to take them, but if I didn't I couldn't go to school. Likewise the government can't force you to get an ID, but try and go through any day without having one and you'll quickly find it's almost impossible. You can't drive, cash a check, buy prescriptions, or buy beer without one.