Your spouse is the greatest help to spiritual growth outside of God and the Bible. God designed it that way.
If your spouse is not saved or does not know the Bible rightly divided then you cannot expect them to be doctrinally knowledgable, but they are still your greatest asset. Do not neglect them. Minister grace to them according to 2 Tim 2:24-26.
Where else can you find a daily opportunity to exhibit the love, obedience, accountability, selflessness, duty, longsuffering, and charity needed to grow in godliness?
Your spouse will helpfully remind you to grow up. This is called edification; it is God’s will for you (2 Tim 2:4, Eph 4:16).
Your spouse will honestly identify where you need improvement, at which time you can practice God’s will of being thankful in all things (1 Thess 5:18).
If you and your spouse will ever minister God’s will together you must first minister God’s will to each other.
“Let nothing be done through strife or vainglory; but in lowliness of mind let each esteem other better than themselves.” – Phil 2:3
~ Justin “spouse ministry” Johnson