"The church is quite old. It was built in the 18th century..."
The developer or history knows very little or has seen few churches in his life. 18th century is not old, is very new. An example of old: historical treasures in Spain (my country):
the Basilica of San Juan de Baños. This temple, founded in the 7th century under the reign of the Visigoth
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monarch Recesvinto.
Well, the developer may be a North American citizen and it is normal that for him the old thing begins in the 18th century. They are so young...