That would be true if the aqeedah laid down by the prophet and his companions constitued the "sects" view that you brought here. But I asure, being muslim is by default having the athari aqeedah or the salafi aqeedah because there is no Islam except what the salaf of this nation is upon
asalamu alaikum
But we are only Muslims no other name.Because there is only One "DEEN" and that is Islam and its believers are Muslims nothing else.
Only One Deen:
إِنَّ الدِّينَ عِندَ اللّهِ الإِسْلاَمُ وَمَا اخْتَلَفَ الَّذِينَ أُوْتُواْ الْكِتَابَ إِلاَّ مِن بَعْدِ مَا جَاءهُمُ الْعِلْمُ بَغْيًا بَيْنَهُمْ وَمَن يَكْفُرْ بِآيَاتِ اللّهِ فَإِنَّ اللّهِ سَرِيعُ الْحِسَابِ﴿3:19﴾
(3:19) The true religion with Allah is Islam. *16 The People of the Book adopted many different ways rather than follow the true way of Islam even after the knowledge of truth had reached them, and this merely to commit excesses against one another. *17 Let him who refuses to follow the ordinances and directives of Allah know that Allah is swift in His reckoning.
Allah has given name "Muslimin" nothing else;
وَجَاهِدُوا
فِي اللَّهِ حَقَّ جِهَادِهِ هُوَ اجْتَبَاكُمْ وَمَا جَعَلَ عَلَيْكُمْ فِي الدِّينِ مِنْ حَرَجٍ مِّلَّةَ أَبِيكُمْ إِبْرَاهِيمَ هُوَ سَمَّاكُمُ الْمُسْلِمينَ مِن قَبْلُ وَفِي هَذَا لِيَكُونَ الرَّسُولُ شَهِيدًا عَلَيْكُمْ وَتَكُونُوا شُهَدَاء عَلَى النَّاسِ فَأَقِيمُوا الصَّلَاةَ وَآتُوا الزَّكَاةَ وَاعْتَصِمُوا بِاللَّهِ هُوَ مَوْلَاكُمْ فَنِعْمَ الْمَوْلَى وَنِعْمَ النَّصِيرُ﴿22:78﴾
(22:78) Exert your utmost for the cause of Allah as one should. *128 He has chosen you for His service *129 and has not laid on you any hardship in your religion. *130 Therefore, be steadfast in the religion of your father Abraham *131 .
Allah had called you "Muslims" before this and has called you *132 (by the same name) in this (Qur'an) also so that the Messenger may be a witness in regard to you and you may be witnesses in regard to the rest of mankind. *133 Therefore, establish Salat and pay the Zakat dues, and hold fast to Allah, *134 for He is your Guardian: What an excellent Guardian and what an excellent Helper!
Every Sect is thinking itself to be "right " and Happy
مِنَ الَّذِينَ فَرَّقُوا دِينَهُمْ وَكَانُوا شِيَعًا كُلُّ حِزْبٍ بِمَا لَدَيْهِمْ فَرِحُونَ﴿30:32﴾
(30:32) who have set up their separate creeds and divided themselves into sects,
each sect rejoicing in what it has
But the Effects of this sectarianism are highly dangerous :
وَأَطِيعُواْ اللّهَ وَرَسُولَهُ وَلاَ تَنَازَعُواْ فَتَفْشَلُواْ وَتَذْهَبَ رِيحُكُمْ وَاصْبِرُواْ إِنَّ اللّهَ مَعَ الصَّابِرِينَ﴿8:46﴾ (8:46)
And obey Allah and His Messenger, and do not quarrel with one another lest you should lose courage and your power depart. Be steadfast, surely Allah is with those who remain steadfast.
{Note:We are practically observing its effects}
Best of luck