First thing is that such a person needs to be prepared to work at finding an answer. modern people are often extremely lazy and distractible - and this is encouraged by our culture. If you are expecting a snappy answer, or a stepwise recipe - Forget It.
You have to be prepared to work at discovering the truth of Christianity At Least as hard as you have worked at your views on politics - which you have probably been discussing and reading-about daily for many years.
Religion is more fundamental than politics - and if you aren't prepared to work at it, then you are self-excluded from the truth; and you will have to accept passively being fed lies and distortions by the mass media and state bureaucracies.
OK - if you are prepared to grant the subject some sustained attention and thought; and you want to find-out about Christianity/ Jesus - then the first question to ask is about authority. What source would you believe on this subject?
As you are not a Christian and unsure about Jesus; there is no point in advising you to consult the Bible, since you have no reason to assume that any of it is true.
Likewise, it is useless to advise consulting a church, because in the first place why should churches be authoritative for a non-Christian? And in the second place (without begging the question) which church? (Especially as many or most self-described Christian churches are primarily leftist political organisations.)
Equally, there is no point in referring you to tradition, because you have already rejected the authority of tradition. Or theology or philosophy, because you won't believe it else you would not be where you are.
There is no point even in saying you should 'use common sense' - or base belief on 'your own personal experience', and start with that - because mainstream modern society operates in opposition-to and denial-of common sense and personal experience.
In sum - there are no short-cuts - the only viable way is the long way around and through.
If not, then what?
If you are an ordinary, typical modern person; then the only conceivable place you can start is from whatever is your own personal intuitive bottom line; whatever is solid and self-validating for you; whatever you personally and actually rely-on and build-on.
What is it that really matters most to you and would matter most even if you were alone on a desert island and could not communicate with anyone; what is it that you are prepared to believe, trust, have-faith-in and know in your secret heart to be true and good - even in contradiction of everybody, every organisation and nation?
This is your discernment, your inner-compass, your personal guidance-system.
You need to know you have such a thing, and you need to be aware of it - to know when it is in-operation and what it is telling you.
You then need to approach the question of Jesus/ Christianity using this personal guidance system to navigate, evaluate and choose-from the many, varied, contradicting sources of information.
It will take considerable time and effort, and only you can do it, and you must choose to do it; but this effort of inner discernment will work, and it will answer your questions.
The process will answer your questions to your own satisfaction (which is what matters) because it does not depend upon any external source of authority. It depends instead on what you already regard as the ultimate source of authority.