The oath is not finalised but will contain:
... believing in freedom of speech, freedom of religion, freedom from abuse; a belief in equality, democracy and the democratic process and respect for the law.
So it will be a secular swearing in will it? And anyone breaking the oath will be subject to what sanction(s)? And all post holders will be more worthy than the rest, will they not?
Modern oaths are not worth the paper they are printed on. They are broken with regularity and without punishment. Look at that rogues gallery that is Westminster, plenty of oath breakers in there.