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Buck’s Theological Dictionary still contains some interesting material, especially when it comes to Religious Sects.
Richard Watson published Biblical and Theological Dictionary in 1831-32, following his Theological Institutes, the first Methodist theology. This 5 volume dictionary contains 1,600+ entries ranging from a paragraph to several pages. Watson addresses philosophical issues, comparative religions, apologetics, matters of hermeneutics, and basic Christian beliefs.
Baker’s Evangelical Dictionary of Biblical Theology is a 753 entry dictionary of Theology.
This is a dictionary taken (with permission) from the website of CARM.ORG (Matt Slick). These are definitions of theological terms. Excellent!
A Dictionary of Catechisms from Puritan, Reformed, and several other denominations, such as Baptists, Broadus, Gadsby, Owen, etc.
This is an old dictionary of Christianity in which a lot of unused (in modern speech) terms are defined. Over 1500 entries.
Heresies of the Church Thru the Ages