Dear Sir,
I would like to refer your second sentence " whole event took place in a foreign country" then how about jurisdiction in India. If that is so then you may please approach the High Court.and get quash the FIR. Even otherwise if you have messages of blackmailing by her then you may approach the HC and seek stay of investigation and later it will be quashed. Further, HC may be asked to set aside the instruction issued by Inspector of police to Church authorities, his action is running in negative, he ought to have registered a case against her for blackmailing and threatening saying that she commits suicide, it is an IPC offence. The Inspector cannot take shelter under such threatening s and issue such instructions to the Church, which is incorrect and illegal.
Now I shall I shall answer your questions as follows:
1)The church is worried if she could block the marraige function by any means by taking a writ of injuction order and if conducting the marriage could cause them any legal issues?
Ans: Let her go to a Civil Court and exercise her right, till then there is no hindrance for the Church to conduct the legally proposed marriage.
2) Can any police officer block the marriage from happening?
Ans: No, he should have obtained such order from Magistrate, he has not vested with such powers. His act is wholly misconceived and illegal.
3)As the case is in the investigation phase ,will the investigating officer accept the evidences that shows her fake story.
Ans: Yes, on the basis of your evidence, he may submit a report that she has submitted a false complaint.
4)Can the young man's family file a counter case against her for filing a false case causing defamation ,mental torture and monetary loss.Can this case be filed straight away?
Ans: Now, at this it cannot be filed, but it can be filed when investigation is completed and closed the complaint as false. However you can file a case against her for blackmailing you and invetigation authority saying that she will commit suicide. More details on mobile.