Hey, according to your church, I and all my brethren are anathema.
So, maybe I'm just returning the favor. :-)
Where do you get that idea?
The teaching of the Church is obviously that being a visible member of the Church is best. What church doesn't think that about itself?
But Church teaching has always allowed for the idea of "invincible ignorance": that one will not be held accountable for that which he is unable to know.
With God, all things are possible, after all.
While I have my disagreements with aspects of Protestant theology, I hope that I may nevertheless approach discussion thereof with charity. I certainly try to do so with my dad, who is Methodist, as does he with me.