"So what if he is?"
One obvious answer is that a person's worldview affects their decision-making.
A false worldview negatively impacts one's decision-making not the other way around. One doesn't make better decisions when they are deceived and believe deeply in things that are not true.
A false religious metaphysical worldview and epistemology only weaken a person's decision-making.
"Do not conform any longer to the pattern of this world, but be transformed by the renewing of your mind." -Romans 12:2
History is replete with political leaders who engaged in faulty decision-making in line with their false religious and political worldviews negatively impacting the world as a result.
Let me give you an example as it relates to Obama. The devil's flood of sexual impurity and immorality on this generation is a deliberate tactic designed to undermine the morality of the people to create a sweeping immoral landslide inducing the great apostasy the apostle Paul asserted in 2 Thessalonians 2:3.
The rise of homosexual extremism is a key piece of the devil's strategy to accomplish this in the world. The Bible says, "As it was in the days of Lot, so shall it also be in the days of the coming of the Son of Man." Obama has been instrumental in his position as president toward assisting the devil toward this goal.
If Obama was not deceived by the devil and had a true worldview and correct religious epistemology, he would not have actually aided the devil, as he has done, but rather engaged in decision-making rooted in truth and acted as salt and light.
Obama was in a political and social position at the height of his popularity to induce a serious Christian revival in the USA that could have taken root and spread all over the world. It was
because of Obama's false worldview that he promoted sweeping sexual immorality toward the corruption of the people in the world instead. Think about that.
Believe me when I say I am in no way being rude to anyone on this thread, and it is not my intention to be rude but when I saw the title of this thread my first thought was "So what if he is?" that's all I have to say.