Being an educated Catholic, you're probably already aware that the Catholic church makes up about 50% of Christians. Throw in the Orthodox church, which says it knows where the church is, but doesn't know where it is not, and you're up to 60%. Throw in the Anglicans and the Methodists, who certainly share the relevant opinions regarding salvation, and now you're over 65%. The remaining denominations are a mixed bag but even ignoring the rest, it's hard to say how you could describe the Catholic church as a Christian outlier. Rather, it is all these tiny denominations which are outliers.