He said to live the way he did, that's all he want from me
Spread the word and witness, he rose on the first Sunday
God wants KL to live a good life being holy, following his steps as a person, and to accept the principal tenet of Christianity- the resurrection of Christ. Coincidentally this is the main separation between the teachings of Abrahamic religions.
This could relate to the vision of Tupac Kendrick claims he had. Kendrick said that he once saw a silhouette of Tupac whilst he was half asleep. Tupac told him to ‘keep doing what you’re doing and don’t let my music die’. The line used here is very similar to what Tupac said to Kendrick. Kendrick might be saying that God sent down Tupac to send Kendrick this message. Alternatively, he could be using God as a metaphor for Tupac in the sense that Tupac is the God of Hip-Hop.
Link to Kendrick explaining his vision of Tupac:
To help improve the meaning of these lyrics, visit "Faith" by Kendrick Lamar (Ft. BJ The Chicago Kid & Punch) Lyrics and leave a comment on the lyrics box