>But I thought human deeds and faith were required to at least hope for salvation,
That is the traditional Roman Catholic and EO position. Historically protestants are strictly monergistic, meaning all of the work of salvation is done by God and we are recipients according to His grace and for the accomplishment of His purposes.
> Isn't Sole fide central to Protestantism?
It is, by Faith Alone we are justified. The natural question thereafter is what induces faith? Is it something which we exert on our own accord? Ephesians 2:8-10 tells us
>8 For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God—
> 9 not by works, so that no one can boast.
>10 For we are God’s handiwork, created in Christ Jesus to do good works, which God prepared in advance for us to do.
Our faith and our works both are from God, we cannot boast in and of ourselves of our own righteousness because apart from Christ we have none and indeed what righteousness we do have either in faith or in works are those which were prepared for us by God and not out of our own will.
> And again, what is glory versus vain-glory?
I'm not sure if you have some kind of point you're trying to make with this but by simple vernacular usage glory is honor and splendor which somebody possesses rightly and vain-glory is honor and splendor which is claimed but not earned or properly deserved.