The primary problem I see with your statement is (bolded area) that baptist don't believe in a Universal church they believe in churches that are self autonomous unless they are part of a convention. So for baptist theology there is no Universal church.
I know many many baptists who believe in a universal church. I graduated from a Baptist college and a Baptist seminary; both of which hold to a universal church. I think your generalization about Baptists is incorrect. However, there certainly are baptists who do not believe in a universal church.
In the above quote, you seem to be saying that one can believe in a universal church or local churches, but not both. I hold to both positions. If I am misundestanding what you are saying, please clarify.
However, many baptist believe in a Universal Church that is invisible such a methodist, Baptist, Pentecostal, etc... are all saved under the same principle. But this isn't Baptist Doctrine in general but individual beliefs of members.
Again, not to quibble, but there is really no such thing as baptist doctrine; at least not formally. There are baptist distinctives that are generally agreed upon.
Yes, as I see it, the Universal church is invisible. It will be gathered together for its first meeting when Jesus comes back.
The question is this. Is their an invisible church through which medium christ considers to be his true body.
Again, I refer you to the scripture I quoted. When a person is saved they are baptised by the Holy Spirit into the body of Christ. The church--the universal church is made up of all people who place faith in Christ. This is automatic. Yes. Christ displays himself in the world through saved people.
Or Does Christ have many churches and the Body applies to each churches (makes me think of multiple bodies)
Yes, to this also. All over the world since Pentecost there have been local churches. These are made up of saved people who unite together based upon a shared understanding of God's word. In the book of Revelation, John writes letters to 7 churches in various locales.
Again, there is a universal church made up of all believers. There are local churches made up of believers in a locale.
or does is their one visible church which medium Christ is properly proclaimed? Where do you stand?
There is no "one visible church".