No it isn't. The ceiling was not painted to promote those things and the religion is not inherently about that.
I disagree.
WHY do you think Michaelangelo was commissioned to do that painting?
WHY would the Christian powers of the day not promote the org that gave them power?
The religion IS inherently about the power it holds over its adherents. Like all religions.
That that particular ceiling doesn’t specifically commemorate a particular crusade or genocidal campaign, is not exculpatory.
Monuments are monuments, art is art. An object can be both. Even if what it is monumental of, is something despicable.
You can argue that one monument’s focus is more or less despicable than another’s, or that one artist is greater than another, but neither of those judgments effect the other.