Babies born to Muslims will begin to outnumber Christian births by 2035, a study has found.

The results, published by the Pew Research Centre on Wednesday, find that followers of the Muslim faith are projected to be the world’s fastest-growing major religious group in the decades ahead.

For years Christians were the largest religious group in the world, making up almost one third of the Earth’s 7.3 billion people. Muslims were second with 1.8 billion faithful, according to the study.