ERISA, Religion -- statutory construction.
While a church agency can maintain an exempt plan, only a church can establish one.
Plain meaning.
Surplussage, Expressio unius..., Remedial statute, Statutory context.
Other statements by same sources in legislative record undermine indications to the contrary.
IRS ruling was not a rulemaking, so only accorded persuasive deference. (Christiansen, not Skidmore)
In subsequent lawmaking that seemed to legislate against the background of a contrary interpretation, Congress never evinced a detailed knowledge of the statutory scheme.
First Amendment not implicated, as churches themselves are free to set up plans.
http://www2.ca3.uscourts.gov/opinarch/151172p.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.