Well, the Particular Baptists have gone and made "covenant theology" a slippery term because they claim to affirm a covenant theology, too—but they don't, not really.
The theology of Particular Baptists is either not quite (e.g., Voddie Baucham) or not at all (e.g., John MacArthur) covenantal. Their views diverge on key issues related to the covenants, their continuity, and implications for the church and sacraments (not just baptism but also the Lord's Supper). I prefer to call their view Baptist Federalism.
In covenant theology (CT), there is a fundamental continuity between the old and new covenants; they both administer the same covenant of grace under different outward forms. But in Baptist Federalism (BF), the old covenants (Abrahamic, Mosaic, Davidic) are not administrations of the covenant of grace, but rather conditional and temporary types and shadows pointing forward to Christ through whom the covenant of grace was formally established. Again, under CT the covenant of grace began in Genesis, whereas under BF the covenant of grace began in the New Testament with Christ (which affects baptism and the Lord’s Supper, which are thus signs of the individual's faith, not seals of a broader covenant community—definitely contrary to covenant theology).
- R. C. Sproul: Westminster Confession of Faith, Covenant Theology (Reformed).
- Voddie Baucham: 1689 London Baptist Confession of Faith, Baptist Federalism (Calvinist, not Reformed).
- John MacArthur: Independent Baptist, Premillennial Dispensationalism (Calvinist, not Reformed).
You certainly are welcome! And I agree, fellowship among the family of God is so edifying.