All the virgins, both foolish and the wise are believers. The foolish were not ready, but the wise were mindful. Short lived zeal is inadequate. There are five false disciples and five true disciples. The absence of righteousness is also a focal point of the parable.
Virgins represent purity.
The church is likened to a pure chaste devoted virgin, responsible, expecting Jesus' return. They do not represent unbelievers who are defiled by sin. Believers are cleansed by the blood of Christ. Sinners are not virgins, they are not expecting the return of Christ, they do not have The Holy Spirit in them, spiritually they are in darkness. Sinners do not believe in Christ.