If you read the book instead of watching "influencers" you'd notice it's explicitly about a Christian theocracy, but whatever.
Yes, it's "about a Christian theocracy" in the sense of "what if a Christian theocracy behaved exactly like an Islamic one".
"Atwood was also inspired by the Islamic revolution in Iran in 1978–79 that saw a theocracy established that drastically reduced the rights of women and imposed a strict dress code on Iranian women, very much like that of Gilead." - https://en.wikipedia.org/wiki/The_Handmaid%27s_Tale#Composit...
Atwood is on record saying the inspiration is Iran 79's Islamic revolution.