We've been down this devilish road before: The Church partners with government (the Church's embrace of public education in the 19th and early 20th centuries comes to mind) as a means to right some perceived social injustice. In the end, government is strengthened, and the Church weakened. Why?
Simple. Those who direct their faith toward government quickly lose sight of God -- the Old Testament is replete with examples.
First the Church says that it will partner with government to solve some perceived social ill. As government becomes the agent of change -- the solution, the Church forgets that, only with God, are all things possible.
Over time, these Christians become a little more statist, and a little less Christian. In the end, Christ is replaced by the state in hearts and minds.
Using coercive taxation as the means to do God's work is an insult to God. God doesn't need plunder to do His bidding. And, he certainly does not want offerings to be coerced. God wants to win hearts, not elections.
Theft at the ballot box is still theft. Coveting your neighbors wealth as a means to run some program is not of God. And, placing your faith in the state is nothing less than worship of an idol.
The social justice movement is not of God. No, it is of the world; of man and state. And, nothing good can come of it.