Two cannot walk together unless they be agreed. A couple should not get married unless they are compatible. Before a couple gets married there should be an understanding on spiritual matters. Without this understanding there could be trouble down the road. Eventually, both parties need to have an equal or comparable commitment to Christ and living for Him in order for the marriage to function in harmony. The Spirit of God has to be present in a marriage and the couple functioning in a personal relationship with the Lord or the two may not walk in the unity of agreement.
Dr Pat Holliday’s Book on Marriage: Keys to a Happy Marriage