Sharing cannot be mandatory and still be Christian. No one claimed anything as his own. The Government has the authority to make this determination in communism. The Individual has the authority to make this determination in Christianity. A welfare state redistributes the wealth a democracy allows its citizens to make the decisions themselves.
Freedom allows people to rise and fall on there own merit.
The success or failure of any system of government is based on the voluntary obedience of it's people. As a nation becomes less Godly there are more and more laws enacted to regulate them. As a people become more rightous they require less laws to govern them. People that are taught correct principles can govern themselves. If all churches taught the laws of accountability everyone would learn to govern themselves.