The Church has to get an idea of her own worthlessness. Help in this study will come from a full reading of Ezekiel 16.
She was found conceived in sin and lying in her own bloods. She was fully cleaned up and adorned magnificantly by her Lover. She became quite impressed with herself and began to dally with the idols and strange passions of her godless neighbours. She courted their affections with payments from her inheritance. She was pitifully backslidden, and a spiritual harlot, although she accepted no hire from her sordid liaisons.
Hear the Lord's comment in verse 14 and 15:
14And thy renown went forth among the heathen for thy beauty: for it was perfect through my comeliness, which I had put upon thee, saith the Lord GOD.
15But thou didst trust in thine own beauty, and playedst the harlot because of thy renown, and pouredst out thy fornications on every one that passed by; his it was.
But toward the end of the chapter it becomes apparent that the Lover intends to honour His covenant still. Thanksgiving and humble rededication are our only jobs in all of this.
But to say the Church is worthless? Look to Calvary and measure the cost, if you can.