Without choice – God cannot be just. Think about it.
And if we cannot truly and freely choose to sin (as opposed to obey and honor God), and totally of our OWN decisions, then we could not JUSTLY be held accountable for our sins. And IF our sins are NOT
OUR OWN decisions and actions, then it would have to mean God wanted and caused us to sin - which we know to be Scripturally false/an impossibility. Alas, this is a discussion for another thread.
But I also see something else that is very unique about Christianity - certainly as opposed to Islam, Hinduism/polytheistic religions, or Mormonism and some of the other "Christianity"-based CULTS. And that is, no one or two supposed holy men went off in some cave or dark corner and came back with writings or proclamations they claimed to be from God. With Judaism/Christianity, God send a large number of patriarchs, judges, prophets and apostles, over 16 centuries, on several continents, and different cultures - with ALL of them preaching, teaching and revealing the very same God, and that are in complete agreement on a tremendous number of teachings about God, Who He is, and His desires and communications to mankind. So many people sent, and covering a myriad of complex issues, they manage to be on the same theological and spiritual page, ALL claiming to be sent by the very same God. And their teachings perfectly and comprehensively fit and subsequently build upon the teachings of those that came before them - all leading to and later focusing on Jesus as being God in the flesh.
Compare the Bible's inspired writers to, say, Mohammed claiming He received a series of revelations from God via the archangel Gabriel. Or Mormonism's Joseph Smith saying he was directed by an angel to find revelations from God on buried Golden Plates. Each of these have ONE person attesting that God communicated with them - without any corroboration from history, or any substantiating miracles or fulfilled prophecies. To believe these religions, one must have total faith in the ones whom started them and came up with their religion's writings. Or key people that came after them, whom said THEY say, God communicated with their founder. And yet look at the subsequent factions that quickly developed following key religious figures. Which of Mohammed's grandsons do you follow? Which is correct? And let's not forget that Islam was largely spread by the sword - "convert lest we will behead you!" The only people Muslims hate more than Westerners and Christians is rival Muslim factions. The God of Christianity unfolded His words in front of the people, in broad daylight with many fulfilled prophecies and miraculous confirmations. He takes Israel out of Egyptian bondage and with copious loot, without firing a shot - all while performing incredible miracles that were also perfectly designed so as to simultaneously humiliate the so-called Egyptian gods (where's the Sun god during three days of Yahweh turning out the lights?).
Uniquely, the Bible reads like a 21st century history book filled with known archaeologically substantiated information. It is factual and well-corroborated. You read of places in the Bible - even back to ancient, OT times, and you can find most of them on a map or that have been archaeologically documented. So many religions piggy-backed off of Christianity (to give them credibility), and THEN their teachings totally contradicted Christian teachings found in the Bible.
The Pantheistic religions believe god or gods are all part of all that exists. But how can any god only exist ONLY within his creation? What created HIM? We know the universe had a beginning. So any god that is also a part of the universe, necessarily, once did not exist. And any such god could not create himself!
What other book asserted to be from God compares to the enormous detail in the Bible? It's a life road map revealed by a loving Creator to His creatures, so that they will understand Him, desire and pursue fellowship with Him, and to love Him BACK. It's a highly detailed and comprehensive instruction manual on how to live and how to gain eternity with God. There are few subjects that it does not cover. And here's the thing: When we look at the heavens, the universe, the planets and stars, the incredible levels of detail built by God into our spectacular planet - on the chemical, biological, microscopic levels, our DNA, the complexity and design apparent in such a mind-boggling array of precisely interactive systems and guiding physical/chemical/astronomical laws - what we see is a Creator Who has left absolutely NOTHING to chance. He has created with a level of detail we scarcely understand.
And as this God of Christianity has been a fanatic about the tiniest of breath-taking details, would we expect such a God with such fanatic and extraordinary attention to detail simply throw us here without any instructions or concern as to how we conduct life on our planet, how we interact with each other, how we are to be stewards of his magnificent planet? This is a Creator God Whom we would expect precisely the miraculous series of communications such as our Bible reveals. And so where is such comparable book with anywhere near the tremendous level of detail and substantiated and validated (through extensive fulfilled prophecies, miracles, or anything like the Resurrection, etc) with such enormous credibility? Such a comparable book is NOT TO BE FOUND! No, all we have are people that have written or asserted communications from gods that have no credibility, no credible evidences whatsoever - just the lone word of people like Joseph Smith and Muhammad. Or pantheists that tell us God is a part of what once did not exist. He (and/or many other such gods) basically would have had to create himself/themselves. But we know that's impossible. And none of these many supposed gods have left us any credible communications to substantiate their existence with expected evidences.
One other thing - no other major religion's founder claimed to actually be GOD (as Jesus clearly did). And a God that DIES an agonizing, humiliating death for His CREATED beings? That reveals His followers to be fickle, disobedient and continuously rebellious and clueless? That He continuously both loves, punishes, redeems/restores, gives eternal promises? That left so much examinable and powerful physical and historical evidence? Wow! Let's not forget the many DETAILED and FULFILLED Bible prophecies, not to mention those revealing and leading up to Christ.
NO other religion has ANY book or writings that are remotely like the incredible/miraculous book that is our Bible! It's preservation alone is a testimony to the power and purposes of God!