Not if they have not accepted Christ as their Savior.
A Christian is one who is baptized in the name of the Trinity - one who has "confessed with your lips that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved" (Romans 10:10) - is a baptismal formula. By being baptized, we become children of God, and called Christians, and have the potential to achieve the promise of eternal life. Our response to our baptismal promise - our lived life - will determine our final destination. Whether we are judged as wheat or weeds is based on God's judgment of our lived response to His call and our promise at Baptism.
Regards