hiya, thanks so much for being patient as I get around to answering your question. the first part of your question:
With regards to the hadiths -there are different schools of thought though. If some agree on certain hadiths and another does not who should you follow?
There aren't different schools of thought on Hadith. Please see below for a brief overview of Islamic theological sciences:
Firstly there is the source material. This comes in two forms:
- The Holy Qur'an - which is the revealed Word of God. it is preserved exactly as it was revealed.
- The Hadith - compilation of sayings and actions of the Holy Prophet SAWS. these are preserved in the form of compiled narrations with the differences between varying accounts recorded and analysed. all narrations are validated, verified, classified (according to reliability) and analysed according to historical context.
Then there is the interpretation of the source material - these are known as Tafsir or expositions which go through all the source material with a fine tooth comb, analyse and provide commentary and contextualisation.
Finally, there is the application - this is divided into Fiqh (rulings on daily life including worship) and Shariah (Islamic Jurisprudence). This is where schools of thought come in. There are four main schools of thought which were founded by the most proficient scholars of that era (Hazrat Imam Abu Hanifa RA, Hazrat Imam Shafi'i Ra, Hazrat Imam Ahmad in Hanbal RA and Hazrat Imam Malik ibn Abbas RA) who gathered together many scholars and debated and discussed for years before writing guidance and rulings that can be applied by lay Muslims.
The schools of thought agree on all core matters but there are differences in the detail eg. they may pray slightly differently etc. they are all seen to be accepted. diversity of practise is a part of Islam and is not an issue.
I have not covered differences between sunni and Shia ideologies or differences in Aqeeda (principles of faith) here, can cover that if you wish on a seperate post. I also have not covered the theological sciences of Tasawwuf which is internal purification but can again explain how that is organised if you wish.
As to the second part of your question:
Why is interpretation of the faith vague enough that multiple hadiths could exist and still be disputed?
I hope the first part of my answer clarifies to you that Islamic theology is complex rather than vague. it is a dynamic faith which has developed over centuries through scholarly debate and dialogue - hence there are differences of opinion. in fact differences of opinion are healthy and of course there will be discussions around validity and reliability when discussing historic sources (which is what Hadith are). I would rather there be disputes and differences because that demonstrates independent thought.
Islamic theology is extremely complex and it is not therefore possible for a lay Muslim to simply pick up scripture and apply it. Hence the Qur'an itself directs Muslims to seek guidance. the scholars and schools of thought are there to answer questions and provide 'how to' guides for daily life.
I think the short answer to what you are asking is that it's a complex theology - it is incredibly detailed and there is absolutely nothing vague about it. the differences of opinion stem from the fact that it is complex.
hope that answers your question. if you wish to experience how truly not vague Islamic theology is, I suggest you pick up any of the books on Fiqh or even start with Ihya ulum ud'Deen by Hazrat Imam al Ghazali RA.