The bible already has a perfectly good word for derived, surface imitations of Christianity that differ deeply enough to matter but are similar enough to be dangerous temptations: heretic.
The official LDS, and Christian Science would qualify. Shinto and Hindu congregations would not.
Scientology would be a wrong religion that would qualify by most modern definitions as a cult, but NOT as heretic. It was never meant to be fake Christianity.
Actuall, Sciientology was a bet between John Campbell and L- Ron Hubbard, Hubbard betting that he could turn one of his stories into a religion and make the loons follow it.