I know that God will never give me more than I can handle but what if I am (and always have been) unequally yolked due to his deception? I am married now. What should I do? Am I justified if I choose to leave? Will God forgive me? How do I know that leaving is the right thing? Help me, please!!!!
Many other people will focus on 1 verse concerning marriage, and ignore 15 other ones that say other things. Understanding marriage from the Bible, requires knowledge of all verses and their full context, not 1 verse used in opposition of other verses. I will give scriptures for what I say:
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Option 1 (The Law) - Separation then he either repents, OR he commits sexual immorality and you can leave him
To the married I give this charge (not I, but the Lord): the wife should not separate from her husband (but if she does, she should remain unmarried or else be reconciled to her husband), and the husband should not divorce his wife. - 1 Corinthians 7:10-11
I tell you that anyone who divorces his wife, except for sexual immorality, and marries another woman commits adultery. - Matthew 19:9
Now, sexual immorality is a hard one to actually follow as a man, because this would include looking at porn. Any man who views porn, his wife is justified to divorce him according to Jesus Christ:
But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart. - Matthew 5:28
You are justified to separate from him because he lives like a lost person:
But now I am writing to you that
you must not associate with anyone who claims to be a brother or sister but is sexually immoral or greedy, an idolater or slanderer, a drunkard or swindler. Do not even eat with such people. - 1 Corinthians 5:11
No exemption is made for spouses, from that statement. It is love to not enable a brother and sister to continue a bad life-style and support them in that behavior that leads to destruction in their life.
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Option 2 (Faith, Hope, and Love) - Don't bother with this unless you can move a mountain with faith.
(Mountains are symbolic types of demonic strongholds, just as the promise land had mountains to conquer with the kingdom of darkness dwelling upon them. In the NT, a mountain in this context refers to mountains the devil holds spiritually that we are to overcome.)
"Truly I tell you, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in their heart but believes that what they say will happen, it will be done for them. - Mark 11:23
With this option you would also separate because he is living wrong. Now if you can't or don't want to leave him for practical reasons, you can also follow this option.
This option uses spiritual authority in Christ, to bind the demons operating in his life that pull him away from you in behavior.
This requires Bible study, believing God's word, speaking God's word, and requires relationship with Jesus Christ who will do miracles along the way toward deliverance.
Or suppose a king is about to go to war against another king. Won't he first sit down and consider whether he is able with ten thousand men to oppose the one coming against him with twenty thousand? - Luke 14:31
When you go to spiritual war with words against the kingdom of darkness, you have to stand and overcome. You have to know how to do this. If you never moved a mountain before with faith, this one would be your first then, and you'd have to learn to do it with Christ.
Old Kenneth Hagin videos on youtube are probably the best starting point if you never heard of doing this. Then you would follow it up with some other teachings, like Andrew Wommack
http://www.awmi.net/reading/teaching-articles/believers_authority/
The point of Option 2 is to bring God's will to pass as it is in heaven, to bring that will to happen upon Earth just as Christ prayed:
your kingdom come,
your will be done, on earth as it is in heaven. - Matthew 6:10
In heaven there are not broken or deceiving marriages. It's not God's will you have a broken or deceiving marriage. God did not give you this problem... satan gave you the problem. The idea that God will not allow us to be tempted beyond we can bear, does not mean, God sends us a bunch of temptations... the devil sends them:
When tempted, no one should say, "God is tempting me." For God cannot be tempted by evil, nor does he tempt anyone; - James 1:13
When the devil sent these temptations at your spouse, he did not rebuke the devil but yielded to the devil against God's will. Perhaps there are also things you did, to yield to the kingdom of the devil.
You repent of any and all sin in your life, and God washes you clean.
Then you take your authority in Jesus Christ, to rebuke the devil from your husbands life, and you stand.