Should a Christian take an active part in politics in order to improve his or her country?

No. The Lord Jesus made no attempt to help rule his country. He resisted attempts to make him a ruler, and refused any position of power over others. The Lord knew that his Kingdom was “not of this world”, and that his first duty was to preach the gospel. A Christian should carefully avoid becoming mixed up with the affairs of the world.

Sometimes governments may do things that Christians cannot support — for example, going to war, or promoting gambling. Nevertheless as far as possible, a Christian should keep himself out of public affairs, and devote his energy to preaching the gospel and doing good to those in need; this was the example given by the Lord Jesus.