Christian Wants to Baptize Son in Church
Question

                I am married to a Christian woman and I live now in Lebanon and she lives in her country and we now have a baby and his age is about 2 months. Now she is telling me that she wants to make the baby Christian and she wants to take him to church to make this happen. What do I do? I need a solution and what should I say to her.
Praise be to Allah.Firstly: 
It is permissible for a 
    Muslim man to marry a Christian woman, if she is chaste. Because Allaah says 
    (interpretation of the meaning): 
“Made lawful to you this 
    day are At‑Tayyibaat [all kinds of Halaal (lawful) foods, which Allaah has 
    made lawful (meat of slaughtered eatable animals, milk products, fats, 
    vegetables and fruits)]. The food (slaughtered cattle, eatable animals) of 
    the people of the Scripture (Jews and Christians) is lawful to you and yours 
    is lawful to them. (Lawful to you in marriage) are chaste women from the 
    believers and chaste women from those who were given the Scripture (Jews and 
    Christians) before your time when you have given their due Mahr 
    (bridal-money given by the husband to his wife at the time of marriage), 
    desiring chastity (i.e. taking them in legal wedlock) not committing illegal 
    sexual intercourse, nor taking them as girlfriends”
[al-Maa'idah 5:5]
However it is not advisable 
    to marry a kitaabi (i.e., Jewish or Christian) woman nowadays, because it is 
    fraught with dangers, especially with regard to the children’s upbringing. 
Shaykh Ibn Baaz (may Allaah 
    have mercy on him) said: If the kitaabi woman is known to be chaste and to 
    keep away from the things that lead to immoral actions, then it is 
    permissible, because Allaah has permitted us to marry their women and eat 
    their food. 
But nowadays there is the 
    fear of great evil for those who marry them, because they may call him to 
    their religion and that may lead to his children becoming Christian, so the 
    danger is great. In order to be on the safe side, the believer should not 
    marry her. Moreover, there is no guarantee that she will not fall into 
    immoral ways, and attribute to him children who are not his. But if he needs 
    to do that then there is nothing wrong with it, so that he can keep himself 
    chaste and lower his gaze, and he should strive to call her to Islam, and 
    beware of her evil lest she drag him or the children into kufr (disbelief). End quote 
    from Fataawa Islamiyyah (3/172). 
Hence you can see that the 
    Christianization of the children is one of the greatest dangers to be feared 
    as a result of marrying a Christian woman. Undoubtedly it is not permissible 
    for you to allow that under any circumstances. You should have made it clear 
    to her before marriage that your children would be Muslims and that they 
    could not be made Christians, and that this issue was not open to discussion 
    or compromise. 
What you have to do now is 
    protect your son’s religion and prevent him from being made a Christian. If 
    your wife insists on that then you have no choice but to make her stay with 
    you in your city, or keep the child only, even if that leads to you leaving 
    her and divorcing her. This is a serious matter, because it is the matter of 
    kufr and faith; we seek refuge with Allaah from misguidance. 
It should be noted that the 
    child’s being baptized does not actually make him a Christian, rather he is 
    a Muslim who follows the religion of his Muslim father, and he cannot become 
    a Christian unless he understands Christianity and chooses it for himself. 
    As for his baptism, he has no choice in the matter, and it does not affect 
    the religion which Allaah created in him, which is Islam. 
Try by all means to protect 
    this child and prevent him being taught Christian teachings. Remember that 
    you are responsible for him and that the worst neglect and betrayal of this 
    trust would be to leave him disbelieving in Allaah. 
We ask Allaah to protect 
    you and your offspring and to divert evil away from them.  
And Allaah knows best.