Professional Bentil began his playing career with Okwawu United, making his debut for the team aged 16, before scouts spotted him playing for Ghana at the FIFA U-17 World Championship. He subsequently signed for famed German side Bayern Munich, but never made a first team appearance for the side in his three years there, playing instead for the reserve team, before being released in 2000.

Bentil spent the next few years bouncing around in Europe, playing for Kalamata in Greece, Alania Vladikavkaz in Russia, and Cherno More in Bulgaria, before heading to North America in 2006. He played with Los Angeles Galaxy's reserve team, before signing for Isidro Metapán in El Salvador; he went on to play 33 games in the Salvadoran Primera División before leaving at the end of the 2007 season.

Bentil tackled his third continent in 2007 when he signed for Vietnamese side Khatoco Khánh Hoà. He moved again in 2008 to play for Hapoel Nazareth Illit in Israel, and played the entire 2008-2009 season for the team, before again leaving at the end of the year.

He returned to North America in 2010 and, having been unable to secure a professional contract elsewhere, signed with the Hollywood United Hitmen of the USL Premier Development League for the 2010 PDL season. He scored a goal on his Hitmen debut on May 22, 2010, in a 3-3 tie with Fresno Fuego.

International Bentil was a member of various Ghanaian youth teams as a teenager. Playing alongside current senior international Stephen Appiah he captained the Ghana team that won the 1995 FIFA U-17 World Championship, scoring what turned out to be the winning goal in the 3-2 victory over Brazil in the final. Later he was capped by the U-23 team in qualifying matches for the 2000 Summer Olympics, but has never played for the senior Ghana team.