Q&A: Adding baptism as a requirement for salvation nullifies grace — Galatians 2:21 parallel

Galatians 2:21 — if righteousness is through the law, Christ died for no purpose. The context is adding the law to faith, but Winger draws a parallel: adding baptism as a condition for salvation looks like setting up a work for salvation. He is saved by grace alone through faith (Ephesians 2), apart from works. Requiring baptism for salvation seems to do something structurally parallel to requiring the law, even if it is not the Mosaic law specifically. He finds it a serious theological problem.