Read this excellent article from Cal Thomas.

He sums it all up.with such paragraphs as:

This is not to say there is no role for conservative Christians in the civic life of their nation. There is. But Christians must first understand that the issues they most care about — abortion, same-sex marriage and cultural rot — are not caused by bad politics, but are matters of the heart and soul. Some evangelicals wish to broaden the political agenda beyond these issues to poverty, social justice and the environment. Politics can never completely cure the ills of any of these, but the message Christians bring about salvation and redemption can. Besides, they can never “convert” people to their point of view.

Too many conservative Christians have focused on the “seen” rather than the “unseen,” thinking appearances at the White House, or on “Meet the Press,” is evidence that they are making a difference. And too much attention has been paid to individual personalities, rather than to the One these preachers had originally been called to exalt.

Nothing in the Bible commands believers to reform or redeem society through government and politics alone, or even mainly. Neither is there any expectation that non-Christians will be converted to the Christian point of view, which can vary on some topics, through politics.

It seems that after all the years, the answer we have heard over and over again is the same answer stated in Acts 26:28 where Agrippa said to Paul

“You almost persuade me to become a Christian.”

However, the church continued to thrive even though the government persecuted it. How, by obeying the Word. We can (and must!!!) do the same thing.