Either they are naive and believe they are searching for the long-lost Cup of Christ…
Without being so bold as to condone premarital sex, and without being so naive as to think you’re all chaste angels, I will give you this bit of advice about your sex lives.
Fortunately, Silas remained unaware of Teabing’s true identity and was easily fooled into taking him from the church and then watching naively as Rémy pretended to tie their hostage in the back of the limousine.
There are no more uses of "naive" in the book.
Show samples from other sources
You—Aunty, do you know the stuff in that thing makes Dr. Goebbels look like a naive little country boy?
Harper Lee -- Go Set a Watchman
I realize that some naive sliver of me hoped that he was better than this.