Many Protestant Christians hold a Once Saved Always Saved theology. The vast majority of Protestant Christians hold that we are saved by faith alone and that good works plays no role in salvation.
For the sake of this thread, let’s assume those Christians are correct and that OSAS and FA are completely correct. If those two teachings are correct, then literally all anyone has to do is to believe in Christ as their Savior and God, they need to do absolutely nothing else (though they could choose to do many good and loving works from a love of God). They could sin unintentionally and intentionally and never lose their salvation.
So then, since every faithful Catholic accepts Jesus as their Savior and God, that means every faithful Catholic is saved under the Protestant beliefs of OSAS and FA. Therefore, why do many Protestants continue to attack Catholics if Catholics already are doing the minimum expected requirements to be saved under their own doctrines?
In other words, why would anyone be anti-Catholic since Catholics believe in Christ and must be saved according to the OSAS and FA teachings?