For two of several interpretations of a before-ERISA funding condition, consider:
IRS Publication 778 (Feb. 1972), part 2(b); IRS General Counsel Memo. 36813 (Aug. 16, 1976).
If a church plan has not elected to be ERISA-governed, ERISA’s remedies for causing an employer to fund a pension plan do not apply.
Whatever tax law condition might apply might not motivate an employer to fund a plan. If a plan does not meet a condition for I.R.C. § 401(a) treatment, the IRS could apply Federal tax laws as if a plan is not a qualified plan. But the IRS might be reluctant to do so:
Initiating an examination that relates to a church requires extra supervisory and executive approvals within the IRS.
Developing proof that a plan is insufficiently funded such that it does not meet a condition of § 401(a) treatment under the Internal Revenue Code of 1954 as amended through September 1, 1974 involves unusual and burdensome work.
Denying an employer an income tax deduction for contributions to a plan might have little or no practical effect on a church.
Treating a plan as not tax-qualified might burden employees, retirees, and beneficiaries.