They both can be extremely difficult, and yet they both draw from the same source for strength, security and nurture. This well of strength is the Holy Spirit himself. Religion without the Spirit ammounts to blasphemy, and marriage without the Spirit is only a transient friendship with a little legal status. Our marriages are to be models of the love between God and His chosen ones. They can only be this when they are built solidly upon that very same, specific love.
Weddings can come at a staggering price, and marriage requires lifelong sacrifices.
So too with our relationship to God. We are bought at the tremendous cost of the life of God's own Son, and throughout our earthly walk we are called to sacrifice for His sake - but never, ever in all our years will we sacrifice as much as God himself. Vows and promises are exchanged in a wedding ceremony. God's promises are written forever in His Word. A marriage lasts a lifetime.