There is ONLY ONE reason that it would be wrong to carry a normal size pocket knife in most Christian churches in the United States. Depending on the typical lifestyle of the community some hunting knives are ok too. Of course this depends on why you go to church. The only reason I think
it would be wrong is if there was a biblical scripture something like "It is wrong to carry a pocket knife during church survices". If the bible (God) doesn't say there is anything is wrong with it he probably doesn't care. I assume you are concerned with God's opinion and not other people. But, I'm sure you don't want to upset anyone by doing something so easily lived without.
There is a story in the new testament where I think
Jesus "purged", "cleansed" all meats making it ok to eat the meats that were unlawful to eat by old testament laws. But, Paul (I think) goes on to say that even though Jesus cleansed the food, making it ok to eat it, if there is someone who doesn't know this and sees you eat some he will think you were sinning intentionally and you shouldn't do that. Your example is more important than the food. Therefore educate the guy, then eat the steak.
If you (anyone) hasn't noticed the bible seems
to say a lot of things but then covers the subject with "but if's". That is why it's not a good idea to discuss this stuff on inet groups. It may start a digital holy war.
I can enjoy these discussions but some get MAD if you don't agree with them.