Vampires were strictly religious creatures at the time, not much you can do about it. Van Helsing was being perfectly logical when he talks about the inherent evilness of the vampires because it's true. Still, characters still find Lucy's death tragic, showing that the reason the other vampires are considered malicious is that they are conscious of their actions.
As for sexism, I'd say Dracula is pretty fair for its day. Mina is presented as a pretty rational and intelligent character that only gets left behind because the men in the book incorrectly assume she's too fragile.
Also,
Maybe be cautious about Verne's other books. Like, I loved Off on a Comet as a kid but looking back, it's one of the most anti-semitic books I've ever read.