U2 is my new favorite band, but I don't know alot about them.
Well they are a Irish rock band that started in Dublin in 1976.
Did their Irish culture shape their music? 
Well their music has often been said to often embellished with spiritual imagery. They focus on personal and sociopolitical themes. 
Are they a Christian rock music band.
U2
U2 are an Irish rock band from Dublin, formed in 1976. The group consists of Bono (lead vocals and rhythm guitar), the Edge (lead guitar, keyboards, and backing vocals), Adam Clayton (bass guitar), and Larry Mullen Jr. (drums and percussion). Initially rooted in post-punk, U2's musical style has evolved throughout their career, yet has maintained an anthemic quality built on Bono's expressive vocals and the Edge's effects-based guitar textures. Their lyrics,
to incorporate influences from many genres of popular music. Throughout the group's musical pursuits, they have maintained a sound built on melodic instrumentals. Their lyrics, often embellished with spiritual imagery, focus on personal themes and sociopolitical concerns.
The band formed in Belfast in 2003 with an eclectic musical background, but by 2007, Nine Lies had become an international act. Playing successful music festivals such as in Łodzi Poland Where the band shared the same stage as Fun Lovin Criminals and Sugababes followed closely by the Tryxo tour which kicked