He gained nationwide popularity in the mid-2000s with the success of his songs Niech mówią, że to nie jest miłość (2005) and Psalm dla Ciebie (2006).

His magnum opus to date is the oratorio Tu Es Petrus, Latin for "You Are Peter", which he dedicated to Pope John Paul II.

The oratorio follows the life and death of Jesus, although the prologue was originally written for the Polish film Quo Vadis and deals with St Peter.

Following the popularity of Oratorium Świętokrzyska Golgota, which had opened the year before, and compounded by the intense interest in the life and legacy of Pope John Paul II after his death just a few months earlier, Rubik's new oratorio was immediately hailed as his magnum opus.

The oratorio is based in part on the writings of Pope John Paul II, particularly his poetry, specifically in the songs "Zdumienie" (Wonder) and "Strumień" (Stream).

The song "Niech mówią, że to nie jest miłość" (Let them say that it's not love) was frequently played in mainstream Polish radio stations and charted on high positions.

It proved to be wildly popular among Cracovians, with multiple encores played at the sole performance that took place in Kraków's town square on June 1, 2007.

Zakochani w Krakowie follows the history of the city of Kraków, from its rebuilding in 1257 by King Bolesław V the Chaste to the present, chronicling Polish heroes from artist Veit Stoss to Pope John Paul II, as well as historically significant places, such as Wawel Cathedral and its Bell of Sigismund.

Featuring six new, younger soloists, Habitat opened in December 2007 with a decisive new twist: the addition of a DJ and beatboxers to Rubik's traditional hundred-member orchestra and hundred and twenty-strong choir.

Habitat proved to be much more pop than classical (although Rubik had always blurred these lines) with the addition of several innovations, such as the piece "Most Dwojga Serc" (Bridge between hearts), which featured the composer and conductor himself playing the piano and singing.

The oratorio texts were written by Polish poet Roman Kołakowski, Rubik having parted ways with Zbigniew Książek after Zakochani.

The soloists featured in Opisanie Świata were Zofia Nowakowska, Grzegorz Wilk, Marta Moszczyńska, Michał Gasz, and Ewa Prus.

At the same time, fellow composer Krystyna Moszumańska-Nazar called him an "amateur,"[2] and Cracovian filmmaker Artur Więcek rhetorically asked why his (taxpayer) money should be spent on Rubik's "pseudo-religious" work for the festival.