Is it okay to disagree with Christianity?

Of course it is. You won't go to hell. God wouldn't send you there just because you didn't agree with something; the hell is a place for people who hurt or cause any kind of damage to other people. For example, racist and homophobic people are damned for sure.

Jesus was ignorant about the Book of Genesis .

Read this - and then decide for yourself. We can't decide for you.

Jhn 3:36 He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him.

Jhn 3:18 ¶ He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.

If you want my advice, then I would say stick with Christ. But its your choice.

Depends on how important truth is to you. Jesus Christ clearly demonstrated that He was God, by constantly doing things only God could so. He, God, founded one Church, said it was to remain one, and promised that one Church "The Holy Spirit will guide you into all truth", and "Whatsoever you bind upon Earth is bound in Heaven", and "He who hears you hears Me". God Himself has told us where we can find truth. If you are interested in living your life based on truth, that's where to find it.

It's a free country.

Definitely, it is! And if that's your path, and what you want, then all the power to ya.

Although speaking as someone who utterly loathes Christianity? Who left that behind for atheism, more or less by default, because I didn't fully realize I had other options? Who spent many years as an atheist, before having this profoundly life-changing mystical experience, that helped me find spirituality in my own way, and on my own terms, outside the Christian framework? I just wanted to briefly mention that you've got other options. That Christianity does NOT have a monopoly on spirituality, or even God/divinity, no matter HOW much they like to pretend as if that's the case! That there are plenty of other religions, plenty of other ways of being spiritual, and plenty of other approaches to the divine! (Deism, pantheism, panentheism, pandeism and polytheism, or any combination thereof, just to mention a few.)

And.. perhaps that piece of information won't ever matter the slightest bit to you! If atheism turns out to be your ideal path... Only reason why I mention it is because, for me..? It really wasn't! As I have spiritual needs and yearnings that go FAR beyond what strict atheist materialism has to offer! Although also, like I said..? Christianity SO isn't it for me, either! And if it had been a matter of just that religion vs. atheism? I still would have chosen atheism every time. But luckily..? It isn't! And there are also various Pagan paths, Eastern philosophies, hidden occult knowledge, all sorts of really interesting spiritual practices, and the whole nine yards... But no one told me these things, back when I was 17, and had just realized that Christianity was a disgusting pile of sh*t! So.. that's why I'm telling you. Because also..? Once you start adopting this kind of diehard skeptical, rationalist attitude, towards absolutely everything in life..? You start subconsciously shutting your mind off to spirituality, of any kind. At least speaking from my own experience, as someone who's been there, done that. And who didn't fully realize just how small and insular my reality had become, and that hardline materialism can also serve as its own kind of rigid mental straitjacket! Until I did heavy doses of psychedelics, and broke myself out of there. But.. if I had NOT started dabbling with that..? I very well might have been stuck there, still. It's hard to tell, really.

It's absolutely okay. What's not okay is to blindly accept something.

Why not just embrace indifference for the easy path, and be included with the great multitude?

Of course it is. There's a lot of nasty stuff written throughout the Bible. People should have the right to be against Christianity or any religion or belief if they so chose. That's the beauty of free thinking.

It is more than okay. There is no valid reason to agree with Christianity, except where Christianity has adopted an earlier philosophy.

For example, the Golden Rule predates Jesus, so, you can agree with it without giving credit to Christianity.