There are aspects of what you write where I see echoes of God's truth, and other parts of what you write which appear, to me, to be out of touch with God's Word (at least as I understand you).
. . . Treating the poor as objects of pity and patronage is also not the only theme in the Christian tradition. St. Basil said the excess food in our pantry is the poor's by right.
There is a sense in which this is right. We have a moral
obligation before God to help those in need. This is taught throughout the Bible. One relevant passage is this one:
Isaiah 58:6 "Is not this the fast that I choose: to loose the bonds of wickedness, to undo the straps of the yoke, to let the oppressed go free, and to break every yoke?
7 Is it not to share your bread with the hungry and bring the homeless poor into your house; when you see the naked, to cover him, and not to hide yourself from your own flesh?
8 Then shall your light break forth like the dawn, and your healing shall spring up speedily; your righteousness shall go before you; the glory of the LORD shall be your rear guard.
9 Then you shall call, and the LORD will answer; you shall cry, and he will say, 'Here I am.' If you take away the yoke from your midst, the pointing of the finger, and speaking wickedness,
10 if you pour yourself out for the hungry and satisfy the desire of the afflicted, then shall your light rise in the darkness and your gloom be as the noonday.
God help us, we so often fall so short of this.
However, I feel your diagnosis of the problem, or part of it, is wrong:
In some ways, the Social Gospel movement was the attempt to get unstuck from the western obsession with individual salvation, to set Christianity back on a surer footing that actually has something to do with the ethic of Jesus.
Individual salvation is absolutely essential and is a major focus of the Bible. True salvation will lead to a heart that loves God and loves people. This leads to being generous and pouring ourselves out for the hungry. When it doesn't, something is wrong. And yes, I'm aware that a lot is wrong. But the problem is not "obsession with individual salvation", but a lack of true individual salvation in Christ.
Sin is the deep problem which causes poverty and greed.
We can only be set free from the power of sin by salvation in Christ.
And, yes, this salvation involves people hearing and believing the Good News that Jesus died for our sins and then becoming His disciples and being transformed into His image.
It is a terrible error to set individual salvation from sin against helping the poor. Either without the other is unbiblical.