A letter addressed to Samuel Whitbread, Esq., M.P., in consequence of the unqualified approbation expressed by him in the House of Commons, of Mr. Lancaster's system of education; the religious part of which is here shewn to be incompatible with the safety of the Established Church, and, in its tendency, subversive of Christianity itself. Including also some cursory observations on the claims of the Irish Romanists, as they affect the safety of the Established Church