trueyogi,
You are going through a tough period in life. You will have to gather strength and grit to navigate the upheaval.
Your wife is likely convinced that celibacy, and donation of time and money to BKs, will earn her a spot in a Golden Age that is about to start shortly in a few years. Unfortunately, the Golden Age is late by at least 40 years. Even if your wife knew about this, it will be extremely difficult for her to give up her belief.
You have to answer a few questions to yourself:
Physical intimacy is an integral part of marital life. On occasion, an individual can lose interest in sex, e.g., due to medical condition. Are you willing to spend a celibate life with your wife? If yes, then you must find a way to do so. If no, and it's perfectly OK to answer no, then you have some thinking to do.
You are young and it's perfectly fine to seek another life partner. Your unhappiness will have an impact on your children. You and your children might be better off with you divorced or remarried, and shared custody of children.
1. Start protecting your money and property.
2. Inform your and your wife's families about the situation. Be upfront and tell them about all efforts you've made to fix matters. See if your wife's parents/family can talk her out of it.
3. Seek professional marriage counseling. Assuming you are in the city from where BK Shivani's family is, you should be able to find some. See if your wife will go with you.
4. Start consulting a divorce lawyer.
Good luck.