Question

Which aspect of the Roman Catholic Church established in the 300s remains today?

The Roman Catholic Church’s leader is still the bishop of Rome, or the pope.
The Roman Catholic Church remains the official church of the city of Rome.
The Roman Catholic Church remains the only official church.
The Roman Catholic Church’s power structure remains unchanged.

Answer 1

The first statement. The church’s leader is still the bishop of Rome (the pope). The other statements are not correct — Rome does not have an official state church today, the Catholic Church is not the only church, and the church’s structure has changed over time.