What do you mean by "improve"? Christians have improved the lives of humanity since time one. Christians built hospitals and schools. They invented marvelous things to make life better for mankind. They work hard. They love and help those who cannot work. They thank God for the bountiful blessings He showers on them and their families. They worship God and seek ways to be better at returning His love. Christians are the least passive people on earth. They die for love of God and neighbor. Jaxxie, you need to look at who you describe as Christian. You are mistaken.