Gwen Stefani and Blake Shelton have been together for over four years. The two are profoundly in love with each other, but they can't tie the knot yet. Although they are ready to take their relationship to the next level, something is stopping them.

The couple has been constantly in the headlines for their alleged engagement, wedding, and baby plans. However, none of these things have happened yet. In a cover story by People, multiple sources revealed that they "have hit a roadblock" as they plan their future together.

It cannot be denied that Blake Shelton is very serious when it comes to his relationship with Gwen Stefani. He has become a father figure to her three sons, Kingston, Zuma, and Apollo, to her former husband of 13 years, Gavin Rossdale, since their romance began. Their families have been close together.

The 43-year-old country singer even thought about proposing to his lady love. But, a source close to the former No Doubt frontwoman revealed that religion gets in their way.

Gwen Stefani is a Roman Catholic. Hence, she hopes to have a church ceremony with Blake Shelton.

Miranda Lambert's ex-husband recently revealed that his faith started to grow stronger when he began dating Gwen Stefani. He gave him all the credit for helping him regain his faith in love and God. He even told The Tennessean that he now believes in God more than ever in his life.

The most important part of his belief was just how Gwen Stefani came to his life and their long-standing relationship. He now found it weird that if they took God out of it, it just didn't make sense at all. But if they put God in it, everything that was happening in their lives made complete sense.

The Voice coaches are sure that they have found "the one" that they have been looking for in each other. They are also "very serious" about their romance, so their friend saw that their relationship would surely head toward marriage.

The Nobody But You singers, who collaborated for Blake Shelton's new album, Fully Loaded: God's Country, are said to be both "very like-minded" and comfortable with each other. Gwen Stefani brings a sparkle to her boyfriend's life, while her love for him can be seen. As a result, she has been loved by everyone around him.

After their heartbreaks and divorces, Blake Shelton and Gwen Stefani leave everything in the past. They are now more focused on living a full life together. "They fall more and more in love with one another, and their happiness quotient keeps rising," their friend said.