I will pray for your cousin's strength in his religion and finds solace in his family's faith as well. If he is stoic enough, he will stay with the Lord he loves already.
However, I must say this: I also pray that your cousin spends time with his biological mother. No one should be denied the chance to see their parent/child - no one. Love is needed regardless of religious choices. I personally believe in forgiving the sinner.
Besides, her son may be her only hope to convert to Christianity.
It will work out for good in the end. *smiles softly*