Throughout history, God has used immoral and even wicked men to sometimes bless and other times punish people and nations. Although he uses them, it doesn’t mean he grants them special favor nor does he condone their sin or wickedness.
On that note, I believe Barack Obama was chosen specifically to be used by God as a theoretical magnifying glass, helping us to see how debased we are as a nation. Many Evangelicals voted for a man who ushered in anti-Christian policies like Obama’s support for taxpayer-funded abortions and other policies which in turn unleashed hell on Christian bakers, the Little Sisters of the Poor and Hobby Lobby. Obama wasn’t a friend to Israel, either.
If Obama was God’s choice for America, then so is Donald Trump.