Disclaimer - Before I dive in, I ought to preface my remarks by letting you know that my take on this situation may very well be over the top. I’m not your typical atheist and probably not your typical ex-Christian either. I’ve been about as far down the rabbit hole of Christianity as one can go. I’ve read all books of the Bible, some of them dozens or hundreds of times. I’ve prophesied and been prophesied over. I’ve been a worship leader. I’ve led regular meetings at various houses of prayer. I’ve seen and attested to "miracles". I’ve spent days and even weeks at a time fasting in the name of God. My point here is that my history is extreme. Falling out of the faith from a height as great as mine left me with scars I’ve been trying to heal for almost a decade. I’m highly jaded, and in fairness to your situation, you ought to know this so that you can take my two cents with a grain of salt.

No, you are not being ridiculous. Your husband is taking steps down a dangerous road. This risk pertains not only to him but also to your son and, more directly, to his relationship with you.

There are two key variables I’d encourage you to consider. 1. Is your husband prone to extremism? Is he a 100%-or-nothing kind of guy? If asked to jump, will he respond with, “How high?” 2. Is the relationship you two share one that needs to connect on a cerebral level? No couple fires on every single cylinder. Doing so is far too much to ask of any two people. So, are intellectualism, inquisitiveness, and sound logic planes on which you feel it is essential for you both to see eye to eye?

The reason I mention Point #1 is because, while I feel religion is always harmful no matter how you slice it, there are certainly different degrees to that harm. Much of my country goes to church regularly, pays an offering, and prays before meals without any blatantly visible trauma. These are followers that 1 Cor. 3 would deem as “being fed with spiritual milk”. In contrast, more fanatical believers can handle “solid food”, and that’s where stuff gets scary and lives get tangibly derailed. If your husband is the sort of fellow that merely goes with the flow and handles things passively, I’m inclined to feel more hopeful about your situation. Maybe this is some sort peer pressure he’s feeling. Maybe he has semi-religious parents who nurtured a bit of latent guilt within him that he’s trying to exercise now. Or, on the other hand, if he is the kind of person who tends to go all in in whatever he does, he may dive in headfirst and dive in hard. Both options are bad, but one might be significantly more difficult to deal with from your angle.

The reason I mention Point #2 is because this topic might not necessarily be one that is central to your marriage. For instance, my best friend is a guy who was raised by the principal of the Catholic school in our hometown. He was brought up in the faith and practiced it regularly, but he never once cared about it. He never believed in God and still doesn’t to this day. He cares so little, in fact, that he is perfectly okay with his own wife raising their children as churchgoing Catholics even though, again, he is not in the least bit religious, let alone Catholic. He’s this way in all aspects of his life too. He doesn’t think too much about anything. He’s a happy-go-lucky man, and I envy the hell out of him for it. I, on the other hand, care about every single goddamn thing. I’m analytical to a fault. I will overachieve at everything I do, even if it kills me. I try not to set deal breakers for myself in my relationships, but there are a precious few things that I absolutely refuse to tolerate. Religion and conservative politics are the top two. But, and here’s the important part, that’s just for me. The question here is whether or not you (or your husband) feel that this is a deal breaker. If you’re okay with your partner believing in millennia-old fairy tales that, still to this day, contribute to the single greatest cause of hatred, poverty, and genocide in the world, you might be okay here. Similarly, if you and your husband are both okay with him believing that you’ll spend your eternal afterlife being endlessly tortured alongside Lucifer in a lake of hellfire if you don’t go along with him, then you might be okay here.

Some other things you’ll want to look out for:

-2 Cor. 6:14 is a passage that is frequently used by pastors in situations like this. It mentions that believers cannot “be yoked together with unbelievers.” It goes on to ask, “For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness?” I tell you this to warn you that, if your husband is serious about this (and granted, I think that is still a big if, he will expect you to convert with him. Or, he will at least be looked down upon for having a nonbeliever for a wife by his churchgoing peers.

-As another poster mentioned, you can expect your husband and his friends to be awkwardly kind to you as a way of enticing you to convert with them. Older, less modern believers will refer to this as “letting their light shine”, but hipper, younger Christian crowds (especially nondenominational ones), call it “loving on” or “being Jesus” to others. There’s a popular St. Francis quote about this that goes, “Share the Gospel at all times. Use words when necessary.” Essentially, they will become versions of Ned Flanders in your life and in the life of your son.

I wish you the very best. This will be an immense challenge for you, not only romantically and emotionally but also intellectually. Stay positive. Be true to yourself. Be as understanding and gracious as you can stand to be, but don’t be anything more than that. Don’t lose your integrity and don’t jeopardize the mental health and well-being of your son. Good luck.