Trisha Yearwood shared with ET the challenges that she has faced while preparing to play the Virgin Mary in Fox's upcoming live TV musical, The Passion, but she praised her husband, Garth Brooks, for his support.

"He's been really a great support in this, because these sessions have not been easy for me," Yearwood told ET. "It's been a little challenging, and I'll get home at night and be like, 'I don't know! I don't know if I can do this!' and he's like, 'You got this!'"

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Set in New Orleans, The Passion will be a modern-day retelling of Jesus Christ's final days. The story, narrated by Tyler Perry, will cover Christ's Last Supper, betrayal at the hands of Judas Iscariot and his trial overseen by Pontius Pilate.

Yearwood is part of a cast that includes Jencarlos (Jesus), Chris Daughtry (Judas) and Prince Royce (the apostle Peter), all of whom will wear modern clothes for the production. (Christ will even be seen in an orange prison jumpsuit after his arrest.)

"The dialogue is direct from scripture, and the songs are so well fit to the story," Yearwood said. "For instance, after Jesus is on the cross, Mary sings a song called 'Broken.' It's a Lifehouse song, and it's so perfect."

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Despite all the wonderful music being performed in the production, none of Yearwood's personal tracks made the cut.

"'She's in Love With the Boy' did not fit," Yearwood explained.

Whitney Houston's "My Love Is Your Love" seemed to work better for the story, and it's the first song Yearwood sings in the musical.

"This is not about me trying to do Whitney, because I couldn't if I wanted to," Yearwood said. "It's about putting myself in that moment and trying to relay the message to the people."

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The entire production carries a special message that Yearwood thinks anyone can relate to.

"Whatever your religion, whatever your faith, whatever you believe in, the message is to love one another," Yearwood said. "That's what the takeaway is."

Fox will air the two-hour live event on Palm Sunday, March 20, at 8 p.m. ET/ 5 p.m. PT.