I sometimes ponder on the merits of Islam and Christianity, especially since it seems Islam is growing and Catholicism (at least) is declining.
And just before all the red-necks jump up and down and in with strident shouts of ' it's because the buggers breed like rats!!!" I note your article included the fact that "...... Islam has seen particular success in areas like Africa and Asia that were once considered the future cradle of Catholicism. .....".
Perhaps it has something to do with the idea that Islam (along with Judaism) worships one god, Christianity three?