Living in a world of unbelief

Romans 3: What advantage then hath the Jew? or what profit is there of circumcision?<br /><br />2 Much every way: chiefly, because that unto them were committed the oracles of God.<br /><br />3 For what if some did not believe? shall their unbelief make the faith of God without effect?<br /><br />4 God forbid: yea, let God be true, but every man a liar; as it is written, That thou mightest be justified in thy sayings, and mightest overcome when thou art judged.<br /><br />5 But if our unrighteousness commend the righteousness of God, what shall we say? Is God unrighteous who taketh vengeance? (I speak as a man)<br /><br />6 God forbid: for then how shall God judge the world?<br />Why does unbelief appear to be increasing in the world today?