Jesus Christ died for all of our sins...God the Father gave us free will (Adam and Eve)...all you need is faith (even as small as a mustard seed), but your faith must me in Jesus Christ. No amount of “works” or following some religious law (dietary or circumcision, etc) will guarantee you eternal life...you need to Believe and have Faith (Galatians). You should not think of you body as yours...it is a vessel that Christ wants to use to get the Good News revealed. For me...it is that simple...it comes down to believing!!!! Look at Abraham...he was saved on Faith alone because there was no “Law” at that time.
However faith is always connected with action as Paul did in the book of Hebrews. Faith is not static so ‘by faith Abraham...obeyed’ and left his home land.