Khilafiyah (difference of opinion) is normal among Muslims. And if someone learn Islam through "methodology of understanding" he must be know the background of these differences and how he should behave toward it.
Unfortunately, not every Muslim have enough understanding on khilafiyah. And the worse is, they are easy to be attacked by 'disease' that called "Hizbiyah" or "extreme spirit of the corp". It make them establish or join in an exclusive group which they regard their group as the only right Muslim group while the other are wrong.
My advice is, do not easily influenced by "the hizbiyun" who try to convince you that their group is the only right Muslim group and if you do not follow them you will go to hell.
Which group that on the right path?.
Not every Muslim understand that what Rasulullah (saw) meant with "the saved firqah" is based on characteristic of Muslim, not based on group like tandzim, jamaah, or hizb.
So, do not thinking "I should join in this group". Just try to become a better Muslim.