My argument is that its not as consequential either way. I don't think Christianity was the reason for the rise of the West but I'm also pushing back against the notion that it was the source of our ills and that secularism is necessarily th best way to organize society. Like I said, England to this day has a national church and so does Denmark. You can say the population isn't religious but at the institutional level those states are not secular and yet they are immensely wealthy.
Not really, certainly not in terms of scale. The scale of plunder, exploitation, and violence massively increased with the waning of the power of the church and the rise of nationalism and the empires that brought with it(Spanish, English, French). Its not that the Church was a bulwark against those things, its that the nationalist order in Europe allowed for those things more so than the pre-national one which was founded more so on the Church.
So sure, we "progressed" materially but only, as you admit, through exploitation of other peoples which reached an unprecedented scale as the nation-state model eclipsed the power of the Church.