Which is right and wrong?

Hafiz Ibn Kathir (Rahimahullah) in The Signs Before The Day of Judgement (pg. 14):

"Awf ibn Malik reported that the Prophet (Peace be upon him) said, 'The Jews split into 71 sects: one will enter Paradise and 70 will enter Hell. The Christians split into 72 sects: 71 will enter Hell and one will enter Paradise. By Him in Whose hand is my soul, my Ummah will split into 73 sects: one will enter Paradise and 72 will enter Hell.' Someone asked, 'O Messenger of Allah (Peace be upon him), who will they be?' He replied, 'The main body of the Muslims (al-Jama'ah).'

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Where should I begin? I am writing out of dejected feeling I had lately. I’m afraid I don’t have the capacity to take action into what had happened and pray that my family is protected with such confusion and misleading aggregation with such alliances we could never had anticipated that it is erroneous. With names used and people involved makes us more convinced that they are true enough to tag along.
How could this happen when only 1 prophet preaching to only 1 God had given us an extraordinarily precious gift of all time, the Quran and Sunnah to be used as an infinite guidance to lead our life from the day we were born until the day we die. Is it that hard just to follow whatever is inside the holy Quran than to create new things using our limited mind. Satan with hundreds and thousands of years of experience will lure us to stay far astray from the true path with every tactics ever imagined. If they couldn’t persuade us to do bad things successfully, then they’ll let us do the good things improperly. The most treacherous and silently absorbs into our life is things that looks right to our eyes but in fact it is the wrong. We wouldn’t apologize for something we didn’t know it’s wrong all along, wouldn’t we? Same concept goes here, where we will not repent to Allah for what we felt as not a sin or so we think. That’s the plan!
The true meaning of success is not based on how we comprehend today. We are so used to think that being successful is by being rich, having our dream job with big houses or big cars. How and when will we understand that it’s not that at all? It’s a life of test! Every single day and every single night...what have we done or what will we do then? Who we follow is not really important and at the end of the day, we alone will be accountable, responsible and answerable to God of our own wrongdoings, not whom we follow with all our heart....by that time, it’s too late to regret and repent. Enter Islam wholeheartedly, not leaving anything which not suits us behind and take things which only serve our desire into our life. Everything that happened to us is considered a test and is a proof of our ‘Iman’ towards Islam. This is the only valuable possession to save us in the hereafter.
So let us all be a true truth seeker with the guidance from the Quran and Sunnah, not just believing and following any people whomever they may be with whatever title they may hold or worst case from any books written by people who are still open to silly mistakes and not free from sin. The prophet (pbuh) himself whom we knew as free from sin repents more than 75 times a day and yet he was promised to enter heaven. Shouldn’t we as a layman who is open to flaw repent more than the prophet? May Allah SWT guide us to be in the true path and not being persuaded into following the wrong team/organization.
Who amongst us did not want to go to heaven and be blessed to exploit all the offerings as a reward and is permanent?! Lasting forever and ever...that’s an incredibly long time, don’t you think? Compared to our lifetime here in the world, it’s only 60 years approximately, the longest might be a century if God wills. Even the devil didn’t want to go to hell, seriously....that’s the worst place to return to and is permanent as well! We will not get use to the hardship and will not endure the pain forever!
I am not angry at anyone nor am I trying to spread hatred amongst ourselves, just a little reminder to myself and to others who is kind enough reading this to be extra cautious in this test. There’s nothing to lose if we try everything we have in this world to be in the right path, for there is no way we can turn back time and save ourselves in the hereafter without being in the true path. Try to reserve any school of taught that is strapping in our mind for it might be the reason we lack behind. Fail to plan is planning to fail and the result of this examination will be all our deeds in this world, be it a good or bad including our intentions which haven’t being done will be calculated and punished as fair as it could be, better than any court human ever seen.
Let’s concentrate on our mission in life more than our greed for wealth and anything else in this world. Don’t judge people because we are not in the position to punish anyone. Let it be in Allah’s will that human changes and do good deeds. Our purpose is only to convey the message from the prophet to the whole mankind, not adding anything which is not from him and the rest is up to Allah. May Allah bless us and choose us to be guided on the true path and safe us from the torment of hell fire and suffering in the grave. We won’t like it there...