Is it possible to believe there's God but not believe in any religion ?

The mystery's of faith an GOD are beyond human comprehension.

Faith concerns questions which cannot be settled by evidence.

You can't see the wind, but you know it is there because you can see what the wind is doing. You can know that the wind is there because you can feel it.God is like the wind, you can't see him.

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One effect of letting the Bible out of the monasteries is that there were going to be some who go their own way and try it on their own. I do. And I have been doing so ever since I first started reading the Bible. Perhaps not the intended purpose originally for teaching us to read and then letting us read the Bible. It worked mostly to unite the people with one side or the other and then splinter off into many ways to be a Christian. Yours and mine are just some of the many ways there are to be one. Don't let it bother you. I just don't hang well with being a participant in organized religions. I am too irresponsible.

Religious Fanatics are not Religious. They use their scriptures to hate.

Sensible and Respectable theists should be embarrassed the former exists.

It is very possible, you don't need a label. Ignore religious fanatics.

Your right. You do not need to join any religious group to follow God. Just read scripture and let it speak to you.