The future of Christianity in Europe is fading as Islam continues to thrive, according to a new Pew research study.

The study highlights a trend showing that between 2010 and 2015, deaths among Christians outnumbered births by nearly six million.

In that same time frame, the study shows that the Muslim population increased by more than 150 million people to 1.8 billion. In 2015, there were 2.3 billion Christians in the world.

Researchers add that migration, such as the refugee crisis, have played a factor increasing the Muslim population in certain regions, including North America and Europe.

“In Germany alone, there were an estimated 1.4 million more Christian deaths than births from 2010 to 2015,” the Pew study shows.

As Christianity continues to decline across Europe, Islam appears to be expanding rapidly. During that same time period, births among Muslims in Europe outnumbered deaths by more than two million.

“Between 2010 and 2015, an estimated 223 million babies were born to Christian mothers and roughly 107 million Christians died – a natural increase of 116 million,” the report adds.

But Islam is growing at a much faster rate than Christianity.

“Within 20 years, more babies will be born to Muslim women than to Christian women world-wide, the latest sign of the rapid growth that could make Islam the world’s largest religion by the end of the century,” the Wall Street Journal reports.

“Thanks to a steady decline in religion and the high costs of maintaining these historic buildings, a rising number of churches are being given new lives that may have horrified their founders,” the report continued.

422 new mosques have appeared in London that are “built on the sad ruins of English Christianity,” reported the Gatestone Institute, citing that Christian churches across London are being converted into Islamic mosques.

“Not only buildings are converted, but also people,” the Institute noted. “The number of converts to Islam has doubled; often they embrace radical Islam, as with Khalid Masood, the terrorist who struck Westminster.”

The rise of Islam throughout Europe isn’t anything new, as the studies show that a dangerous trend is arising.

One of the most important points from the Pew study is that Islam is slated to overtake Christianity as the world’s largest religion by the end of the century.