"I tell you the truth, it is hard for a rich man to enter the kingdom of heaven. Again I tell you, it is easier for a camel to go through the eye of a needle than for a rich man to enter the kingdom of God. " Matthew 19:23-24
The first christians were communists too:
"Now all who believed were together, and had all things in common, and sold their possessions and goods, and divided them among all, as anyone had need. So continuing daily with one accord in the temple, and breaking bread from house to house, they ate their food with gladness and simplicity of heart" Acts 2:43-46 "All the believers were one in heart and mind. No one claimed that any of their possessions was their own, but they shared everything they had. With great power the apostles continued to testify to the resurrection of the Lord Jesus Christ. And God's grace was so powerfully at work in them all that there were no needy persons among them. For from time to time those who owned land or houses sold them, brought the money from the sales and put it at the apostles' feet, and it was distributed to anyone who had need" Acts 4:32–35
Well, religious insight is, by definition, supernatural, so there is no surprise that there is no external logic to its' conclusions.
But the fact is very much objective: Christianity did justify slavery, did justify feudalism and did justify Capitalism - moreover, it played fundamental role in function of all these societies.
