An anti-gay group has announced it will hold a 40-day fast to combat same-sex marriage.

The Virginia-based Family Foundation has announced a coordinated fast, in order to influence the US Supreme Court into rejecting same-sex marriage when it hears the first of a series of appeals cases in October.

The group said: “Jesus has issued a trumpet call and declared a holy fast to gather his people together for a time of consecration, to purify our way of thinking and cleanse our way of living.

“Our state and nation are mired in confusion and post-modern thinking and nowhere is this more evident than in the current debate raging about what constitutes marriage.

“The Supreme Court begins their session on October 6th. We fully expect them to take a marriage case sometime in the next year.

“Join us for 40 Days of Prayer, Fasting and Repentance for Marriage from August 27 through October 5, 2014.

“Our 40 Days will culminate on October 5th just before the court begins their session.”

A federal appeals court is expected to rule on Virginia’s same-sex marriage ban soon, after District Judge Arenda Wright Allen first struck down a law banning same-sex marriage in the state in February,

Following the ruling, the ban will head to the Supreme Court.

Watch the group’s creepy movie-style trailer below: