A key, to unlock the door, that leads in, to take a fair view of the religious constitution, established by law, in the colony of Connecticut. With a short remark upon Mr. Bartlet's sermon, on Galations iii. 1. Also, a remark upon Mr. Ross, against the Separates and others. With a short observation upon the explanation of Say-Brook-plan; and Mr. Hobart's attempt to establish the same plan : By Ebenezer Frothingham. [Eleven lines of Scripture texts].