This guide sets out the law of religious liberty across the regimes that actually govern it, organized by who is imposing the burden. Part one covers the Free Exercise Clause after Employment Division v. Smith and the general-applicability doctrine that has become its most productive branch, and part two covers the Establishment Clause and its shift to a historical-practice analysis. Part three covers RFRA and its state analogues, and part four covers RLUIPA in prisons and land use. Part five covers Title VII workplace accommodation and the undue hardship standard corrected in 2023. Part six covers what counts as a protected belief and how sincerity is assessed, and part seven covers the ministerial exception and church autonomy. Part eight covers the conflicts with anti-discrimination law, public funding, and public schools. Part nine covers procedure, remedies, and deadlines. Part ten supplies drafting and counseling checklists for claimants, employers, and government bodies.