In summary of Faith:
Whosoever believes that there is a person from amongst the Awliya who has a route to Allah, other than through following Muhammad (SAW), is a disbeliever and from the Awliya of Shaytan.
As for Allah creating the creation, His providing for them, His answering their supplications, His guiding their hearts, His helping them against their enemies, and other such things that promote benefit and repress harm - then this is for Allah Alone. He does this through setting up whatsoever causes (asbab) He Wills [that would lead to acquisition of these benefits] and the mediation of the Messengers has no role to play in this whatsoever.