The [Christ's] Church has ["only"] 1 Foundation

https://www.youtube.com/watch?v=OQv4EAwMFoQ

1 The church has 1 foundation,’Tis Jesus Christ her Lord;
She is His new creation, through water-by the Word.
From Heav’n He came and sought her, to be His Holy bride;
With His own blood, He bought her, and for her life, He died.

2 Elect from every nation,Yet 1 o’er all the earth,
Her Charter of Salvation: 1 Christ, 1 faith, 1 birth.
1 Holy name she blesses, partakes 1 Holy food;
And to 1 hope she presses, with every grace endued.

3 Long with a scornful wonder, men saw her sore oppressed,
By schisms rent asunder; By heresies distressed.
Yet saints their watch were keeping, to hail a brighter day,
When God should stop their weeping, take their reproach away.

4 Through toil and tribulation, and tumult of her war,
She waits the consummation, of peace forevermore.
'Till with the vision glorious, her longing eyes are blest,
And that small church victorious, shall be the church at rest.

5 Yet she on earth has union, with Father and His Son,
And mystic sweet communion, with those whose rest is won.
O blessed Heav'nly chorus! Lord, save us by Your grace.
That we, with saints before us, may see You face to face.

6 The evening sun is shining, the cloudy day is past;
The time of their repining is at an end at last.
The voice of God is calling, to unity again;
Division walls are falling, with all the Creeds of men.

7 Back to the 1 foundation, from sects and Creeds made free,
Come saints of every nation, to blessed unity.
Once more the ancient glory, shines as in days of old,
And tells the wondrous story— 1 Christ, 1 faith, 1 fold.