He's after the same damn thing as Orochimaru, Sasori, and the Elric brothers from FMA... he wants to bring back the dead. I guess that's what makes a true villain, wanting to go against natural laws with God. Yes, I do believe in Jesus. He and God are the only one who's have ever brought back the dead. So I guess Obito, Orochimaru, Sasori, and Ed & Al are looking for Jesus.
P.S. The coloring of the sky, and masked Obito are good. Never stop painting.