Most personally convincing reasons you don't believe.

[Drich]

This is an easy one..

What if God's ultimate rule was to simply do the best you can to love/worship Him and each other as you would want to be loved/treated?

Now lets apply that to the whole of humanity. Most of which are different. Meaning different strengths and weaknesses. Lets say you are a song writter and to love God with all of your you need to write and sing songs. And I'm really gifted at bible research. Now imagine a church dedicated to only my pursuit, where the services and the worship are directed towards those who like to worship via bible study as I do...

Now, that's just fine and dandy if in fact worshiping God with all that you can muster centers around bible study, but If you have a gift like song writing, then you are not following His greatest Command. Therefore, there needs to be a separation so that you can full fill God's greatest command by using all of your gifts and talents, and I can do the same.

Where Christianity is different than all other religions is it hangs on just two Primary rules. And because of this, the execution of said rules was and always has been intended to be different. Even in the bible the letters to the different churches has Paul giving and addressing different rules to different regions/cities. Because they all have different strengths and weaknesses.

This is where people like you mess up with their understanding of the church. Paul likes the church as a body made up of different parts. Just because we don't look the same or have the same function in the body does not mean we are excluded from being a member of the body. This works on an individual level as well as on a larger systematic scale. Meaning a denominational/schism scale.

What God's ultimate rule would be is subject to debate.

Not blaspheming against the Holy Spirit would be a strong contender.

And blaspheming against the Holy Spirit is PRECISELY what happens when one is going to the wrong church.

You  imply belief in Jesus 'indemnifies' a believer, in spite of attendance/membership/fealty to a heretical Christian schismatic church.

That view is heretical in and of itself.


Heretics don't go to heaven, they burn, and they burn forever.

Ahhh, No.. It's not up for Debate.
Jesus Himself Identifies God's 2 Greatest Commands:
Mat 22:34 The Pharisees learned that Jesus had made the Sadducees look so foolish that they stopped trying to argue with him. So the Pharisees had a meeting. 35 Then one of them, an expert in the Law of Moses, asked Jesus a question to test him. 36 He said, “Teacher, which command in the law is the most important?”

37 Jesus answered, “‘Love the Lord your God with all your heart, all your soul, and all your mind.’[c] 38 This is the first and most important command. 39 And the second command is like the first: ‘Love your neighbor[d] the same as you love yourself.’[e] 40 All of the law and the writings of the prophets take their meaning from these two commands.”

If you Love God with all your being then you would not blaspheme the Holy Spirit.

Two, the Holy Spirit is not the church. WE Are the church. If you are going to a Jesus Christ centered Church and believe this church will help you full fill those two commands then it doesn't matter who's name is on the building.