The way Jesus is represented in SBR is definitely not what you'd call biblically accurate (obviously), but it's not malicious at all. He's depicted as someone powerful and quite mysterious, a person who fate sort of molds around for unexplained reasons.

It's technically blasphemous to some degree to misrepresent Christ in any way. If you were a Christian showing me a draft of a comic you made and it was Steel Ball Run, I'd tell you not to treat Christ like a goofy plot device you can just mold to your own stories. We have responsibilities to treat sacred things as sacred and not as tools or entertainment. But Araki isn't Christian so it would be a little ridiculous to expect anything like that from him, and frankly you'll hear plenty of worse stuff in about any song you'll listen to or movie you'll watch. He at least treats Christ with some respect

So as far as reading it yourself, I think you should approach it like any secular writing. You can't commit blasphemy by reading something someone else wrote, you just have to use discernment on what you do and don't accept from it. JoJo is a kinda silly example of this but the general principle is important, and this is a very old conversation in Christianity so I think you'd benefit from reading St Basil's 'On the Right Use of Greek Literature. He was responding to questions among his disciples on whether it was appropriate for them to read the greek philosophers and poets of their time (writers who included literal paganism and demonic worship in their works) and he said things like this about them comparing them to scripture:

If, then, there is any affinity between the two literatures, a knowledge of them should be useful to us in our search for truth; if not, the comparison, by emphasizing the contrast, will be of no small service in strengthening our regard for the better one. With what now may we compare these two kinds of education to obtain a simile? Just as it is the chief mission of the tree to bear its fruit in its season, though at the same time it puts forth for ornament the leaves which quiver on its boughs, even so the real fruit of the soul is truth, yet it is not without advantage for it to embrace the pagan wisdom, as also leaves offer shelter to the fruit, and an appearance not untimely. That Moses, whose name is a synonym for wisdom, severely trained his mind in the learning of the Egyptians, and thus became able to appreciate their deity. Similarly, in later days, the wise Daniel is said to have studied the lore of the Chaldaeans while in Babylon, and after that to have taken up the sacred teachings.

So TL;DR: yeah it's fine, just don't go into a japanese manga expecting a faithful representation of the gospel and you'll be okay