Ummm...not so much. Southern Baptists are in decline. (https://religionnews.com/2021/05/21/southern-baptist-decline-continues-denomination-has-lost-more-than-2-million-members-since-2006/)
Broadly, evangelicals are about even but church-going evangelicals are being replaced by non-church-going "political" evangelicals.
All the GOP's bases are slowly losing membership while Democratic bases are growing. That's why they are resorting to rigging elections.