These numbers are vastly inflated. They can’t put a fraction on that in the pews on Sunday.
Two things. They count as “members” both people who are still alive but in nursing homes and no longer attending (probably legit to still count those IMHO) and also people who left the UMC, didn’t officially resign their membership, and have been attending and giving to other churches for years/even decades. Because those people didn’t officially revoke their membership, they’re counted as still members. LOL