It’s quite good. It’s essentially the same as the Westminster Confession of Faith(1647) which is the Presbyterian confession with the main differences concerning baptism and church government.
This link compares the two of them side by side:
http://www.proginosko.com/docs/wcf_lbcf.html
3. The purest churches under heaven are subject to mixture and error; and some have so degenerated as to become no churches of Christ, but synagogues of Satan; nevertheless Christ always hath had, and ever shall have a kingdom in this world, to the end thereof, of such as believe in him, and make profession of his name.