There is no way im buying that he is force sensitive. It probably would have shown itself at some point in his life while in the first order. He gets beat up by multiple people, including just some random stormtrooper who i would imagine is not force sensitive. At one point he mentions to using the force to han, clearly showing he doesnt even know what it is. Just something hes heard of.
He doesnt seem to have any of the intuition stuff that force users have. Many of them have this when theyre children and he shows no signs of it in this movie. He doesnt sense rey when she is behind him and han has to point her out to him lol. We only saw 2 force users in this movie. You cant even say snoke is because we never see it, never hear about it. Hes just the leader of the first order in this movie. Not a sith, not a darth, just some ugly guy. So really its just rey and ren.