Hello w33z3rswtr,
I pray that the Lord will comfort you during this time, as it is clearly weighing heavily upon your shoulders. I also will pray that he will enlighten you and impress upon your heart what you should do.
From the little bit of information you have given, it sounds like your husband was never really a Christian. It sounds like he has been planning to break up for some time now since he has a specific planned time-frame of where he wants to be, and unfortunately I suspect, who he wants to be with. It also sounds like he is saying he is an atheist to justify breaking up, again another reason to suspect that he was never a Christian to begin with. (I say this from personal experience.)
Now since you do not mention it, I have to ask. Are you a Christian? Do you live a Christian lifestyle? There are many people in this world who call themselves Christians but do not live as a Christian would. Sure they may go to church and say grace at the Sunday meal, for example, but they do it for appearances or because it is what is expected of them.
So when I ask "Are you a Christian?", I am asking have you personally accepted Jesus as your Savior? Have you been "Born Again"? Do you, on faith, put your life in Jesus' hands and go where He leads you without the concerns of this earthly world, with an attitude of "Let His will be done"?
If not, then I believe the Lord may be trying to lead you to Him.
If you are a true Christian, then you will know that what I say comes from the Bible and not from me.
I think you can agree that when a married couple believes in the same things they get along rather well. Paul suggested that believers should marry other believers to avoid any major problems in a marriage. In 2 Corinthians Paul was trying to show that believers and unbelievers was not a good match. I will quote it here to show you:
Do not be yoked together with unbelievers. For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness? What harmony is there between Christ and Belial ? What does a believer have in common with an unbeliever?
(2 Corinthians 6:14-15 NIV)
So if you married an unbeliever, well there is
part of the problem. Is your husband an unbeliever? I cannot answer that. You know him better than anyone. Jesus tells us in the Bible that He would not lose a single one that His Father gave to him. So if your husband is really an unbeliever, then he was never saved in the first place and was not a Christian. This unfortunately is quite common.
Do not be afraid that God will look with disfavor upon you if you get a divorce, because the Bible says that a believer is not bound to an unbeliver. Again I will use Paul and quote the scripture here:
But if the unbeliever leaves, let him do so. A believing man or woman is not bound in such circumstances; God has called us to live in peace.
(1 Corinthians 7:15 NIV)
I will pray for your husband and for your marriage that God will help you and bestow His blessing upon you both. I pray that you will lean on Jesus, as His will is done, with courage and faith.
Also, if it is not to personal, please let us know in the future if you are alright. All of us Christians here care for you.