What is stopping Christians from having just one doctrine/interpretation? As far as I know, there is only one God, one Jesus, and one Holy Spirit, and they are ONE. But, what we have here is dozens of different doctrines (I'm not sure if "doctrine" is the right word for this). Catholics, Protestants, Mormons etc.

And, the driving force of understanding the Bible comes from the guidance of Holy Spirit. And the Bible of course is the best place to learn about God's will. Since there is only one Holy Spirit that is teaching us all,


Why can't we have a universal belief and practice? What creates this different bible interpretations from the spiritual point of view? 
Is it possible to have just one universal doctrine/belief/practice?
The answer is &quot;sin&quot;.  The only thing stopping us from having one doctrine is sin.  If sin didn't enter into the equation, we would agree.
God wants us to agree.

Now I exhort you, brethren, by the name of our Lord Jesus Christ, that you all agree and that there be no divisions among you, but that you be made complete in the same mind and in the same judgment. - 1 Corinthians 1:10

But because of sin, we don't agree.  Sin can be summarized as lust...

&quot;In the last time there will be mockers, following after their own ungodly lusts.&quot; These are the ones who cause divisions, worldly-minded, devoid of the Spirit. - Jude 1:18-19

...and pride.

As I urged you upon my departure for Macedonia, remain on at Ephesus so that you may instruct certain men not to teach strange doctrines  - 1 Timothy 1:3
For some men, straying from these things, have turned aside to fruitless discussion, wanting to be teachers of the Law, even though they do not understand either what they are saying or the matters about which they make confident assertions.  - 1 Timothy 1:6-8

Example
Suppose I am doing ok financially, and I read a passage indicating that I should provide for my brothers who are in need, and for those who minister to me.  Buuut... something inside me tells me &quot;Nah... that money is yours!  You worked hard for it.  Forget those lazy people... they can go get a job and make their own money!&quot;  Well, such a person would be inclined to have a &quot;different interpretation&quot; of those passages I linked.
It's a sad reality... difficult to accept; difficult to consider a possibility in our own lives... but reality none the less.