Religious component of oath represented in home Gospel with date (2,4,2,3)
I believe the answer is:
so help me god
'religious component of oath' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'represented in home gospel with date' is the wordplay.
'represented in' is an anagram indicator.
'with' means one lot of letters go next to another.
'date' becomes 'd' (common abbreviation eg in DOB, date of birth).
'home'+'gospel'='homegospel'
'homegospel' is an anagram of 'sohelpmego'.
'sohelpmego'+'d'='SO HELP ME GOD'
Can you help me to learn more?
(Another definition for so help me god that I've seen is " I could swear this".)