Esteban Ruiz, 21, of Kearny met the 16-year-old at the Good Shepherd Church in Kearny in April 2018, Hudson County Prosecutor Esther Suarez said.
"Ruiz met the victim in his capacity as a youth leader at [the church]," Suarez said.
Ruiz, who currently works for the Centro de Adoracion in Hackensack, was arrested at his home Monday evening without incident. He is facing charges of sex assault and child endangerment.
Anyone who wants to report a sex crime should call the Hudson County Prosecutor's Office Special Victims Unit (SVU) at 201-915-1234.
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