A Christian marries a non-believer, not only that, an atheist. Is the atheist henceforth saved in the eyes of God, or is the Christian condemned? Beyond this, the Bible says it is best not to marry altogether regardless of whether or not the two are equally yoked. So is marriage good or bad in the eyes of God?
Most Helpful Guy
2 Corinthians 6:14 says, "Do not be bound together with unbelievers; for what partnership have righteousness and lawlessness, or what fellowship has light with darkness?"
So for a Christian to marry an unbeliever is to go against sound judgment and to go against this verse. However, God offers forgiveness of sins - He would forgive this, and would never condemn his children (Hebrews 13:5, "I WILL NEVER DESERT YOU, NOR WILL I EVER FORSAKE YOU").
In 1 Corinthians, Paul writes about relationships where one spouse is a believer and the other a non-believer. In such cases, the unsaved one is "sanctified" through the Christian. I would not go so far as to say that the unbelieving one is now saved to go to heaven, but he or she does participate in temporal blessings that the believer receives.
1 Corinthians 7:14
"For the unbelieving husband is sanctified through his wife, and the unbelieving wife is sanctified through her believing husband; for otherwise your children are unclean, but now they are holy."
As for the second part of your question ("So is marriage good or bad in the eyes of God?") I will simply say that it is good - He created it Himself, when He made Adam and Eve. He said that it was not good for Adam to be alone, so He created the institution of marriage to join one man and one woman together.
As for the update ("Is there anything a person can do to lose their salvation once they have earned it?") I'd like to address the wording of the question. Nobody can ever earn their salvation:
For by grace you have been saved through faith; and that not of yourselves, it is the gift of God; not as a result of works, so that no one may boast.
So salvation is a gift, not a reward that is earned. And referring back to Hebrews 13:5, God said that He would NEVER leave or forsake His chosen ones. So once God has granted salvation, a person can never lose it - all-powerful God secures it forever.
If a person shows no sign of being a Christian, they may never have been saved. If a person lives for themselves but claims to be saved, they are probably deceiving themselves.
1 John 1:6
"If we say that we have fellowship with Him and yet walk in the darkness, we lie and do not practice the truth."1
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