I see where there would be a lot of unmet expectations here.
People grow and change throughout life. I think this is probably the hardest thing about marriage. Good to you both for hanging in there.
I don't see how watching tv, going to concerts, etc. unless they were like super demonic or bad in some type of way would conflict with Christianity. I guess it all depends what one is watching or going to see. There are Christian concerts and other Christian media out there, too. Perhaps find something you like in that area to meet each other halfway maybe?
I think even when two Christians both marry each other, they may compare their salvation to their spouse's or their faith or perhaps lack thereof. I think there's are normal human behaviors, but we gotta remember that we're all different. Our way to worship God may be different. We can sure sing the same songs, but we don't all have the same heart.
Here is one thing I have also noticed with new believers at times...I know you both perhaps aren't 100% new to a belief in God, but it feels fresh and new to be reborn in Christ. I have known new believers that took things too strict and too far or out of complete context. I've seen it many times and I"m not certain this is how people mean to be, but a new Christian may not always understand the scripture right away and that makes sense because it's new, it's a study, it's a practice, and a routine. Reading the Bible, there's always something new to learn. One could read the same passage again and again and suddenly be hit with a different perspective than the one they held before.
As an example, I invited a friend that didn't believe in God to a college group. I had known them since Jr. high so many years. I felt like with them coming in to a Christian college group, it destroyed our friendship, but it wasn't God's fault - it was how she had interpreted it to be and going to headstrong without understanding what she was saying. We all make mistakes, though, even people that have been Christian for years and years and down the line we might realize, "Wow, that wasn't right..."
But this friend heard a sermon on "Do not judge." It was regarding the not judging of others and how we shouldn't be so quick to judge before examining our own issues first. I think most of us have heard this message before somewhere down the road. She took this message and went headstrong on the fact that it meant, "DON'T JUDGE ME!" and then would snap back with a part of a verse that says "do not judge". I told her that's not the entire context of the verse and shared with her what the verse was saying in it's entirety. She hated that. In her case, I don't think she wanted to hear the truth. Instead, she wanted an excuse to twist the Bible to her own liking. Eventually, we weren't even friends. I would send her a message asking how she was and she'd literally say, "I don't have time for you right now. I'm doing something for my Bible class." It was beyond rude. I hope these days, wherever she is in life that she has turned around and realized what the correct context of the Bible is saying and that she's a believer in God, but there's honestly no way to know.
I've also known some Christians that I like to call "anti-fun" lol. I mean, I'm not talking about someone saying, "We shouldn't watch that show because it has Satanic practices, witchcraft, and the like," because that makes sense for a Christian not to indulge in those things, right? I'm talking about Christians that say, "No TV at all." or, "Cable is evil." type of people. I can see their view point on some of it, but not all content is the same. I remember years ago at our church, when an elder and a deacon stepped up to take over a youth group one of the elders could no longer run, one leader wanted us kids to live a Christian life - to find how that verse applies to us in the real world. I thought it was great. This other elder, would roll their eyes. The deacon one day said, "Maybe we should all go on a mission trip together so you all can see the hard work that goes into it to help build houses or a church and meet Christians that are from a different country and see what ways they worship that is the same or different," and I thought that sounded like a wonderful cultural experience. The elder spoke up and was like, "No, absolutely not." In that church, though, mission trips were mostly the men - usually the women stayed home waiting for their husbands to come back. It was uncommon for a husband and wife to go on a mission trip together. No kids would go, either. They could've been concerned for safety abroad and kids, but...the topic could've been revisited later, but never was.
I would say a Christian is on the right path if they're avoiding things that completely displease God as not to sin. There is such thing as good, clean fun, though and for our mental health shouldn't be ignored. Everyone needs fun sometimes.
Perhaps talk with him and find out what kind of date he'd like to go on or what kind of stuff he'd like to do or something? Find out what his personal boundaries are at this point to know where the line in the sand is drawn?
