Ruling on one who asks someone other than Allaah for children, or to increase his provision and not reduce it
Question

                What is the ruling on one who believes that a wali (“saint”) or murshid (spiritual leader) gave him a child, or that he can increase or reduce his provision?.
Praise be to Allah.
    Whoever believes that a child may be given by someone other 
    than Allaah or that anyone other than Allaah can increase or reduce 
    provision, is a mushrik whose shirk is worse than that of the pre-Islamic 
    Arabs and others in the Jaahiliyyah. The Arabs and others like them, if they 
    were asked who granted them provision from the heavens and the earth, or who 
    brought forth the living from the dead and the dead from the living, would 
    reply, ‘Allaah.” They only worshipped their false gods because they believed 
    that they would bring them closer to Allaah. Allaah says (interpretation of 
    the meaning): 

    “Say (O Muhammad): ‘Who provides for you from the sky and 
    the earth? Or who owns hearing and sight? And who brings out the living from 
    the dead and brings out the dead from the living? And who disposes the 
    affairs?’ They will say: ‘Allaah.’ Say: ‘Will you not then be afraid of 
    Allaah’s punishment (for setting up rivals in worship with Allaah)?’”

    [Yoonus 10:31] 

    “And those who take Awliyaa’ (protectors, helpers, lords, 
    gods) besides Him (say): ‘We worship them only that they may bring us near 
    to Allaah.’ Verily, Allaah will judge between them concerning that wherein 
    they differ. Truly, Allaah guides not him who is a liar, and a disbeliever”

    [al-Zumar 39:3] 

    “Who is he that can provide for you if He should withhold 
    His provision?”

    [al-Mulk 67:21]
It is narrated in the 
    Sunnah that the power to grant or withhold belongs to Allaah alone. For 
    example al-Bukhaari (844) and Muslim (593) narrated from al-Mugheerah ibn 
    Shu’bah that the Prophet  (peace and blessings of Allaah be upon him) 
    used to say after each prescribed prayer: “Laa ilaaha ill-Allaah wahdahu 
    laa shareeka lah, lahu’l-mulk wa lahu’l-hamd wa huwa ‘ala kulli shay’in 
    qadeer, Allaahumma laa maani’ lima a’tayta wa laa mu’ti lima mana’ta wa la 
    yanfa’ dhaa’l-jadd minka al-jadd (There is no god except Allaah alone 
    with no partner or associate, His is the sovereignty and to Him be praise 
    and He is able to do all things. O Allaah, none can withhold what You give 
    and none can give what You withhold, and no wealth or majesty can benefit 
    anyone for from You is all wealth and majesty).”
But Allaah may give His 
    slave children or increase his provision because of his praying to Him and 
    turning to Him alone, as is clearly demonstrated in Soorat Ibraaheem, where 
    Ibraaheem al-Khaleel prays to his Lord and Allaah answers his prayer, and in 
    Soorat Maryam and Soorat al-Anbiya’ and elsewhere, where Zakariya prays to 
    his Lord and He answers his prayer. And it was narrated that Anas (may 
    Allaah be pleased with him) said: I heard the Messenger of Allaah  
    (peace and blessings of Allaah be upon him) say: Whoever would like to have 
    his provision increased and his life span extended, let him uphold the ties 
    of kinship.” Narrated by al-Bukhaari, 2067; Muslim, 2557. and Allaah knows 
    best. 
And Allaah is the Source 
    of strength. May Allaah send blessings and peace upon our Prophet Muhammad 
    and upon his family and companions.