You can definitely file a fraud case against them as non disclosure of material fact before marriage that she had converted to Christianity amounts to criminal breach of trust and cheating under section 406 and 420 of the Indian penal code.

Also, you can file for annulment or seek divorce on such grounds.

1. Yes you must file a criminal case of fraud against her. Alternatively, you can sue her fraud too. However, you cannot​ do both. So choose. 
2. As she was baptized and you were married under personal laws, it's not a valid marriage at all. It's void ab intitio marriage ie invalid and illegal from start. This means there's no question of seeking divorce as there's no valid marriage. Legally your status remains as a bachelor. You may choose to move the family court seeking a decree for annulment of marriage (this is different from divorce). However, this is not mandatory. You remain a bachelor even without this decree. If you solemnize your marriage to another girl, you won't be prosecuted for bigamy as your first marriage is void ab intitio.

1) it is in your interest to agree for mutual consent divorce 

2) in the alternative file for anullment of marriage as wife has suppressed fact that she was Christian at time of marriage 

3) for valid hindu marriage both parties need to be Hindus 

4) your marriage was would be nullity as wife was Christian at time of marriage 

5) don’t file any fraud case as wife would in counter file case of dowry harassment against you 

You can go for annulment if they have defrauded you. You may not be directed by the court to pay ailmony. Fraud case can be filed in Criminal Court but it will take lot of time and money 

1)Freedom of religion in India is a fundamental right guaranteed by Article 25-28 of the Constitution of India.Every citizen of India has a right to practice and promote their religion peacefully.
2) As per law your wife can covert to any religion, you can not file fraud or cheating case against her.
3) you can file divorce and it is a good ground for divorce, Conversion is a ground for Divorce, under the Hindu Act.

1. This is material suppression off act which makes the marriage a sham one and hence on this basis you can file a suit fr nullity of marriage.

2. However since such suit takes time and may lead to slew of false cases to be filed by her, it is advisable that you propose for mutual divorce and amicably settle the dispute.

3. Such amicable settlement may costs you money in the form of her permanent alimony. 

You can file a case of cheating and criminal breach of trust along with anullment of marriage as your wife was not Hindu at time of the marriage .

Further obtain the copy of such baptism certificate and file as proof of her conversion that they hide from you.

1) Yes, you can file fraud case against them as those people have not inform you regarding her legal religion. And now a days they are forcing you to live separately from your parents.

You first have to decide if you want a divorce or don't want a divorce, because the outcome of filing cases will most of the time end your present family life.

The question you got to ask is how are you going to prove that she had converted to Christianity was not disclosed to you earlier? Also, since you have not registered your marriage, you cannot claim she lied to you. Perhaps you could try gwtgett her employments records and see if she says she is a hindu. Anywhere after the marriage she has said she is a Hindu will be your evidence. So first do the ground work and then draw your conclusion.

No fraud can be filed on this.

You can file a contested divorce case on the same grounds besides cruelties.

Discuss with your advocate and proceed as advised.

Sir,

Please come up with all the documents, so that we can find the loopholes.

If it is a fraud surely we can proceed with nullity of marriage and compensation.