So you're speaking of diversity, not "widespread." However, unless you incorporate per capita as a measure (which it appears the link you post above is doing, though I'm quite skeptical of studies published by a religion itself intended to promote their religion), your assessment, regardless of what your religion says, is wildly inaccurate. Islam is easily #2.
View attachment 87378
And you'll notice in the notes above below the table that Baha'i Faith is included in "other relig."
A new report measures religious diversity by the percentage of each country's population in eight categories — Buddhists, Christians, Hindus, Muslims, Jews, the unaffiliated, folk religionists and members of other religions.
www.pewresearch.org