Skewed like a football bat is right. Wrong about the popularity contest though. Christianity is the world's most common religion (slightly > 30%). Islam is next at less than 25%.
The Christianity breakdown is roughly a 60-40 split, with almost 40% representing the world Protestants. 1/2 the world Christians are Catholic. The remaining 11% or so made up by what remains since the great schism, Eastern Orthodox and in lesser numbers Oriental Orthodox.
Hindu, Buddhism do most of the rounding out obviously. And a less careful thing to note is what is clearly the world's most influential religion (pound for pound). Whether, observed, non-observed, Hasidic, Haredi, Messianic . . . Judaism accounts for only two-tenths of a % among all world followers, yet shapes the globe no less than near equally or greater than most others.