This is an interesting question and not easy to answer. I cannot speak on behalf of all Jews since obviously many have many different opinions of Xtains.
For myself, I have Xtian friends, just like I have friends who are atheists, agnostics or b*ddists. It doesn't matter if a person has a different faith than I do as long as they don't push their faith on me.
To me, i look at xtianity the same why I look at any other religion other than my own. it works for some people, it's not for me. I have my reasons for why it isn't for me, you may disagree but it's all good.
I realize there are many different "flavors" of xtianity. Jehovah's witnesses claim to be xtian, Catholics likewise, and Baptists and Methodists, etc. they all have different beliefs, they all claim to be right. The one thing that ties them all together is their all seeming to agree at least about the "divinity" of jsus.
That by itself makes me kind of lump them together at least on that point. It would seem to me that a lot of xtians raise their "veneration" of him to the point of worship and to me, that means they worship something or someone other than G-d.
To me that's on you who or what you worship. I believe there are xtians who are good people overall, however I have found that the term "xtian" is used just a bit too loosely in a lot of cases.
There is the average "Joe xtian" who believes in jsus, maybe has read his bible once in a while, may even go to church on the holidays.
There is the "Born again until out again xtian. These are those you usually meet in my line of work (corrections) who is all about how he is "saved" at least until the judge lets him out lol.
Then there is the xtian who can never stop preaching, always trying to find converts and is generally a big pain in everyone's tokas.
Basically the last two I have had the most problems with in my personal life. the phony "cartoon xtian" and the "holier than thou at least on Sundays" group. These are honestly people who often are the people who are also the most corrupt. A lot of them rub me the wrong way.
unfortunately since the term is used so loosely, when someone tells me they are a xtian I am not sure where in the world to place them since they can fall into everything from the devout, every day studying their "NT" and being in church every Sunday to someone who says it because he thinks it's his obligation to say it since he was baptized when he was a baby.