Do angels pray for us? I was reading about henotheism and it hinted at the fact that some Christians believe that angels are intercessors.

Quite simply, do angels pray for us?  Can we ask angels for intercession?
I agree with Wayne Grudem who cites 1 Tim. 2:5 in answering this question.


  For there is one God, and there is one mediator between God and men,
  the man Christ Jesus, 
  
  The Holy Bible : English standard version. 2001 (1 Ti 2:5). Wheaton:
  Standard Bible Society.


Based on this we see clearly that Christ is the only mediator between Christians and God the Father. Additionally, Paul calls out the worship of angels as false doctrine in Col. 2:18. While praying to angels arguably may not be worship, in my mind the line is far too fine to mess around with.