Re: "In the end, we as Christians believe that it doesn't matter what we do, how hard we try, how many good works we do, it can never be enough."
But it does matter, which is part of why Christians don't consider you to be Christians, because you are not supposed to try to save yourself, you are supposed to rely entirely upon Jesus and stop adding your filthy rags to his perfect work, it only spoils it:
Romans 4:5-6 "And to the one who does not work but believes in him who justifies the ungodly, his faith is counted as righteousness, just as David also speaks of the blessing of the one to whom God counts righteousness apart from works: "
Isaiah 64:6 "But we are all as an unclean thing, and all our righteousnesses are as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away."
Good works come 'after' salvation, for God's glory and not our own.
The capitalized term 'Orthodox' refers to the Eastern Orthodox denominations, like Greek Orthodox or Russian Orthodox. And they weren't part of the protestant reformation.