Damon Kelly, 53, from St Patrick's Church in Corby, Northamptonshire, posts leaflets opposed to homosexuality.
He is part of a Roman Catholic group called the Black Hermits.
One partner of a same-sex couple received one of the leaflets and confronted the monk in the street, according to The Telegraph.
At Leicester Magistrates Court, Nigel Chapman, for the prosecution, said after the women tried to return the leaflet he told them to: "Keep it, urinate on it, defecate on it."
When one of the women defended the couple's sexuality and pagan beliefs the court heard an "aggressive and fanatical" Kelly told the pair: "You know we used to burn people like you."
The court also heard how Kelly later returned to their house and posted a letter "To the witches from the monk" which described "witches, gays, lesbians and sex-changers" as being part of the "devil's madness".
One of the women "felt she was being targeted by the defendant", according to Mr Chapman.
Kevin Sayce, defending, said Kelly had never aimed to get into a confrontation with the pair: "He picks areas and delivers leaflets.
"It was one of the females that approached Damon Kelly and he defended his opinion as he's had to on numerous occasions."
He added that: "His motive, his calling, is to target the sin and not the sinner."
The case has been adjourned for three weeks to assess if Kelly was fit for unpaid work, he was released on bail on the condition he does not deliver any more leaflets.
