Former pastor Renato Capili Bosi was found guilty of all charges in the sexual assault of a teen girl who the prosecutor said saw him as a "father" figure.
The 14-year-old victim claimed her pastor inappropriately touched her multiple times.
The 12-member jury spent about an hour deliberating Thursday afternoon after eight days of trial.
He was convicted of two counts of second-degree criminal sexual conduct as a first-degree felony, two counts of fourth-degree criminal sexual conduct as a misdemeanor and child abuse as a misdemeanor.
Bosi faces a minimum of 10 years in prison.
"This perpetrator used his position as a man of God to strike fear in his young victim who looked to him for guidance," said Chief Prosecutor Basil O'Mallan.
Following the verdict, Bosi's defense attorney Stephen Hattori said his client, "has faith and will proceed with an appeal. Obviously, we are disappointed with the verdict but we have faith that the system will eventually work."
Both parties presented closing arguments on Thursday at the Superior Court of Guam prior to the reading of the verdict.
It was an emotional hearing day, as both the victim and the defendant were in tears at certain periods throughout the closing arguments.
"Fourteen," said O'Mallan, who wrote out the number in the courtroom for the jury. "That's the age of (the victim) in 2016" when pastor Bosi allegedly got his hands on her.
The victim testified during trial that Bosi allegedly touched her butt and genital area whenever she spent the night at the Bosi's home. The victim, who was also a member at the Living Lighthouse Baptist church, initially kept the allegations a secret due to her father's illness.
"There has been no testimony that she made this up," O'Mallan said.
Hattori opened by describing Bosi as a "man of faith" who devoted 40 years to the church.
Multiple character witnesses even testified that the former pastor was "authentic" and "very good," and that the Bosi family had even opened up their home to others in need.
"Over the course of people staying there, there has never been a complaint," Hattori said. "We ask that you consider this as you weight the testimony and evidence."
Hattori recalled for the jury the multiple testimonies where witnesses described the victim as "dishonest, lies and makes up stories."
"We are talking about a young girl that has so much conflict in her life," he said.
Hattori also told the jury "she claims this happened in May 2016," but she stayed with the Bosi's in the months that followed without any complaints.
"This is a nightmare for any pastor."
Bosi continuously denied the allegations.
Sentencing has been scheduled for July 24.