Can one deny the resurrection and still be a Christian? N.T. Wright says yes; Al Mohler says no. Scripture sides pretty clearly with Mohler on this one:
Romans 10:9: "If you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved."
1 Corinthians 15:14ff: "And if Christ has not been raised, then our preaching is in vain and your faith is in vain. 15 We are even found to be misrepresenting God, because we testified about God that he raised Christ, whom he did not raise if it is true that the dead are not raised. 16 For if the dead are not raised, not even Christ has been raised. 17 And if Christ has not been raised, your faith is futile and you are still in your sins. 18 Then those also who have fallen asleep in Christ have perished. 19 If in this life only we have hoped in Christ, we are of all people most to be pitied."