Arminians on the other hand believe that man has the natural power of will to exercise faith on Christ. Sinners are therefore urged to make decisions for Christ. On this foundation of sand multitudes build their hope for eternity. The decisionist conversion is but the exercise of the unrenewed will. The faith in Christ professed is not the gift of God.
The joy experienced is the joy of the stony-ground hearers. The hope cherished is not the good hope through grace, but the hope of the hypocrite that shall perish. All the religious activity which follows, is not of the Spirit but of the flesh.
"Many will say to Me in that day, Lord, Lord, have we not prophesied in Thy name? and in Thy name have cast out devils? and in Thy name done many wonderful works? And then will I profess unto them, I never knew you: depart from Me ye that work iniquity." (Matt. 7: 22, 23).
SOURCE: http://www.reformed.org/calvinism/index.html?mainframe=http://www.reformed.org/calvinism/misc/arminian_another_gospel.html