"...we are totally dependent on God to make himself known to us. He cannot be grasped by scientific investigation, for he stands above our world of cause and effect. His existence and nature cannot be proven by human reason as the conclusion of a philosophical syllogism, for nothing stands behind and apart from God to explain him (footnote: 'This is not to say that arguments for the existence of God have no value. They make God's existence reasonable but not indubitable.')."
From page 41 of Evangelical Convictions: A Theological Exposition of the Statement of Faith of the Evangelical Free Church of America