Which pre vat 2 popes are you referring to? Which writings of pre vat 2 speak to muslims or jews being saved?
I didn't say that at all. What I said is that pre-Vat 2 Popes approved beliefs that allowed people outside the Church to be saved(Pope Pius IX taught invincible ignorance and Pope Pius XII believed unbaptised infants are saved), while also failing to condemn the rampant heresy among their clergy that other non-Catholics can be saved. EENS used to be very simple, NO ONE outside the Church can be saved whatsoever. But by those Popes expanding EENS to include people who are outside the Church, they justified modernist heretics to start teaching that others outside the Church could be saved too. And they failed to condemn those beliefs.
Now we're stuck with post Vat 2 Popes who actively support the belief that muslims and jews can be saved, with Francis even saying that "It doesn't matter if one is Catholic."
I would not blame the average Catholic layman for thinking BOD is what the Church teaches. It is the fault of the Church for failing to condemn heresies among its own ranks that led to Vatican 2 in the first place, where they proceeded to embrace all those heresies.