Opinion of quote "A Christian society would be what we now call Leftist"?

[Statilius the Epicurean]

I don't think so. If leftism has been concerned to ameliorate material deprivation and level or remove socioeconomic inequalities, (mainstream, traditional) Christianity has historically held that 1) material wealth is suspicious or outright sinful, and 2) the inequalities that exist in this world are ordained by God and will only be removed in the next.

It's true there's a strong ethic of charity in Christianity, but it's as much or even more concerned with its benefit to the giver's soul than to the receiver's material well-being, and charity is not supposed to end poverty or the divide between rich and poor as a leftist society would seek to. And it goes without saying that generally as far as Christians are concerned charity is an individual voluntaristic act, not a social institution like state welfare. Hell, often the argument in the New Testament is that poor people are superior to the rich by virtue of being poor, which is certainly not the modern leftist argument that poor people should be made wealthier today. "The first will be last and the last will be first" is the exact opposite of a call for economic equality in human society.

One could also mention various Christian communist sects which have sprung up throughout the religion's history that sought to create the Kingdom of God or the prelapsarian paradise on Earth in their community, usually in association with some radical antinomianism, but they were traditionally marginal to Christianity and are also a somewhat awkward fit with modern leftism with their lack of a notion of economic or social progress. The societal vision of a sect like the Diggers is these days probably more akin to something like a reactionary trad fantasy than anything modern leftists would like, IMO.