You're making an argument from popularity -- a logical fallacy -- as G26S239 pointed out.
Muslims out number Catholics (and all other sects of Christianity for that matter), so by your reasoning Islam isn't so bad compared to Catholicism?
Catholics out number Protestants, so Catholicism is more valid than Protestantism?
In the general election the Democrat candidate received more votes than the Republican candidate, so the Democratic platform must be more valid than the Republican platform?
Do those sound like compelling arguments to you? If not, why not?