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i fail to see how debating this is debating God
Provided we're posting here to sincerely come to the truth, this is simply reasoning together to come to a better understanding of who Christ was and what it means to say He was fully human
and fully God. I see no Biblical reason why we cannot search Gods Word together to do that. In fact i would say failure to really think these issues through is rather dangerous - unless you are able to stand and defend your ground by knowing what you believe and why then you will run into a lot of problems down the road at some point and you'll be leaving yourself wide open to false teachers to lead you any way they want. Not to scare you, but this is the reality of the church today, if you're not vigilant in guarding your own faith you will face serious problems.
Now if your father doesn't want you to pursue this subject with us any further i won't push you into continuing on - but i would encourage you to study on your own the issues at hand here. Reading books and getting guidance from parents/pastors etc.. is good - but you're the one whose going to be held accountable for what you believe so it'd be good to study on your own as well to get a better understanding of this. Parents, pastors, authors, and Bible teachers can be wrong - which is why Scripture exhorts us over and over again to study these things for ourselves as the Bereans did in Acts 17.
you left with an analogy - but let me leave you with this. You don't have to answer it here but really think this through and study on your own what the Scriptures have to say about it. If Christ was incapable of sin, then why was he able to be tempted? Why did Satan push so hard to try to get Jesus to sin if it was a fruitless endeavor and why, when Satan's temptations of Christ in the wilderness was over, did Christ need the angels to come and minister to Him? There was something in Christ, as a human, that needed edification and to be lifted up. But if this was Someone who couldn't be touched by the temptations of sin the angels were not needed and their involvement here becomes pointless.
Also, how are we expected to imitate this Christ who lived a life without sin entirely devoted to the Father, not because He chose to, but because He was unable to do otherwise? Where is the comfort in turning to a Saviour who cannot really understand our weaknesses and temptations? If the ability to sin is absent there really is no temptation at all. We really would have no High Priest who can sympathize with us and the Scriptures would be proven false because He would not have been tempted at any point like we are.
Hebrews 4:15 says Christ knows our weaknesses because He has gone through all the temptations we face today and prevailed without sin. If you are going to deny that Christ was unable to sin, you'll need to do some serious study to justify to future people you come in contact with on this matter the fact that Christ, who was unable to sin, still faced temptation - which again cannot exist unless the ability to sin exists.