Based on this scripture, how can truth be found in multiple Christian religions?

You will most often never hear about the whole "house divided" from any particular sect of Christianity, because well it does not play well with what they are trying to achieve. Each sect believes that their way is the right way, and the others are wrong in some fashion or another. Some would say that logic would then dictate that there is a high probability that they are all wrong. There is no scripture relating to multiple Christian religions... In Christianity, just as with many other faiths in the world, there are many interpretations. You have to remember, just in the Christian side, there was ancient hebrew, greek, aramaic, and regional arabian dialects used. Some of those dialects have long ago died out, so there are vast and I do mean vast interpretations in text. Biblical scholars, theologians, biblical historians, linguist are in a perpetual debate over wording, their true meanings, etc that has raged for hundreds and thousands of years now. That is why there are vast versions of bibles out there. One that will suit the needs of one Christian groups thoughts as to its meanings in comparison to others. Did you know the oldest bible in the world is the Sinai bible which is located in the British Museum, has over 14,000 interpretations and variations? Its insane really.

According to those people, the house would not be divided against itself. It would have different rooms and different preferences for each room, sure, but they would all be part of the same house holding up the same roof. It's only when the rooms (or the people in each room) start fighting against each other that the stability of the house is in jeopardy.

Such is the theory, anyway. In practice, even those people tend to be exclusionary to the others who aren't close enough to them to be in their little club.

What is the correct way? First, focus on service to God. Second (though actually part of the first), apply the teachings of Jesus to your own life. Third, learn to recognize the Holy Spirit which will testify of truth. Using this, you can find the truth for yourself.

The truth is found only in the bible. True Christians are those following the bible's teaching.

While there may be individuals who try to do right, to the best of my knowledge, the only group doing that is Jehovah's witnesses.

There was only one God, but other religions invented their own versions of god (contradicting the scriptures)

"But at that time, having no knowledge of God, you were servants to those who by right are no gods: " (Gal 4:8)

Just try to compare how beliefs of SDAs, Catholics (Trinity-child baptism-7sacraments-Mary-purgatory-etc-etc), JWs and others denominations.. they have different sets of beliefs and lots were pure inventions and traditions.

So why do many different religions exist??

the existence of different religions mainly came from the intention of a particular preacher or some groups. There were some religions that preach only because of getting money..

"For we are not like the great number who make use of the word of God for profit: but our words are true, as from God, being said as before God in Christ." (2Corinthians 2:17)

Apostle Paul preached the Gospel, not for profit or rewards..

"Or did I do wrong in making myself low so that you might be lifted up, because I gave you the good news of God without reward? " (2Cor 11:7)

There were some religions preach like this..

"Though some are preaching Christ out of envy and competition, others do it out of a good heart:

These do it from love, conscious that I am responsible for the cause of the good news: " (Php 1:15-16)

Envy and competition.

There were so many religions to that invent stories like testimonials of heaven and hell. like they have walked with Jesus on heaven, like those plenty of videos on Youtube. You can't believe in them all at once. Too many people nowadays were making lies.

So my advice? Go with the religion preached by the Apostles. Follow THE doctrines written in the Bible.

----

I grew up a Catholic and I got confused like you too before. but now, I have followed The Old Path.

Truth has a name. Truth is a person. It is the person of Jesus Christ:

"I am the way, the truth, and the life".

Jesus is not any of the denominations. His sheep hear HIS voice and won't follow a stranger.

thank god, the truth is understandable