Heb 11:6 But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.
1Co 7:10 And unto the married I command, yet not I, but the Lord, Let not the wife depart from her husband:
1Co 7:11 But and if she depart, let her remain unmarried, or be reconciled to her husband: and let not the husband put away his wife.
1Co 7:12 But to the rest speak I, not the Lord: If any brother hath a wife that believeth not, and she be pleased to dwell with him, let him not put her away.
1Co 7:13 And the woman which hath an husband that believeth not, and if he be pleased to dwell with her, let her not leave him.
1Co 7:14 For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband: else were your children unclean; but now are they holy.
1Co 7:15 But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such cases: but God hath called us to peace.
Eph_6:12 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
Even God will respect her free-will. However, you have the spiritual authority to bind the spiritual (i.e. demon) force that has deceived her. You must fight this in the realm of the Spirit, through prayer; and in the flesh with patience, and love.
You have the authority and the right to demand (in the realm of the spirit) that the voices of the enemy be silent and that she be granted a clear mind with which to choose. It is up to her to choose (hopefully without demonic pressure) whether to follow your leadership or not. Your best weapon is to bind the ‘spiritual opposition’ and offer love and reason until you can determine her heart's free-will. If she of a free and willing mind makes this choice, you cannot stop her. However, when the voices of the spiritual opposition are silenced, she may then choose truth. Then if a demon is present, it can be cast out. You, as head, have the right to maintain the spiritual climate of your domain.
If you insist on a proper spiritual climate in your home and she departs, that’s on her, spiritually speaking. If she has a legal marriage and a lawyer and chooses divorce, it will take all of your integrity in the realm of the Spirit to do the right thing. I will pray for you. May you find wisdom and strength through this. May you find the proper understanding and obtain direction from the Holy Spirit.
Evidence That Demands a Verdict by Josh McDowell is very good and gives extensive evidence for faith and the veracity of the scripture. God is looking for faith. He does not give PROOF but does give evidence that makes faith a logical choice.