It hasn't gone to Reynolds yet but it's cleared the Assembly, 45-4 in Senate and 68-27 in the House.
Basically, Iowa's new law requires that any employer mandate for vaccinations must include a religious exemption.
But going one further, it gives it teeth by saying that employees fired over vaccine status receive unemployment benefits.
You still haven't offered any real world examples of the slippery slope being wrong. It's also not prophecy coming out of nowhere. It's recognizing fundamental truths that societies have learned the hard way and continue to repeat the hard way, and these truths have been handed down for millennia. Tradition provides solutions for problems that have been forgotten. For example, by throwing out traditional sexual morals for consent the result is sexual mores dictated by power, as demonstrated by Harvey Weinstein. Please show real world examples of the slippery slope being wrong.