What should I do about my non-Muslim wife, who is now pregnant, given that she believes in God but does not follow a specific religion, and when I talk to her about Islam, she feels that I am coercing her into it? And is it obligatory for me to divorce her?

First, you must repent from the emotional relationship with the foreign girl. If the girl is not from the People of the Book, then your marriage to her is invalid, and you must separate from her, as merely believing in God is not sufficient. The child in her womb is your son and is attributed to you as long as you believed the marriage to be valid, because Muslims agree that any marriage which the husband believed to be permissible and engaged in intercourse therein, his child is attributed to him, and they inherit from each other.