BOISE, Idaho — The head pastor at Sovereign Grace Fellowship , a reformed Evangelical Christian church in Nampa, faces a slew of charges after he was arrested for sexual exploitation of a child, court records show.

Matthew Stephen Masiewicz, 53, was arraigned in a Canyon County courthouse on Wednesday after he was taken into custody on an arrest warrant, following allegations that he had multiple photos of child pornography, some being AI-generated. The probable cause affidavit states he had those pictures on his phone and computer at the church.

Investigators began looking into the alleged crimes in August 2025, but the crimes reportedly occurred as early as March 2025, according to court documents.

The probable cause affidavit states the Idaho Crimes Against Children (ICAC)

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