Did Christianity set the western world back a few centuries?

[True Federalist (진정한 연방 주의자)]

If anything, the Western Empire's collapse was aided by the levelling of class distinctions caused by granting everyone Roman citizenship by Caracalla in 212.

The Western Empire lasted as long as it did primarily due to inertia.

[True Federalist (진정한 연방 주의자)]

The question shows that the asker has primarily a linear rather than a cyclical view of history. Even before the Christian Era, society has never been an always upward thing, not even materially.