I could be mistaken but it sounds like the question is: If we are married before we join the Watch Tower Bible and Tract Society, do we have to marry again as Jehovah's Witnesses?
--Edit--
The question is a little ambiguous, however the first answer above is not correct. Jehovah's Witnesses are not required to get married or remarried in their own church (or Kingdom Hall), whatever the circumstances may be. Some Witnesses choose to have a legal wedding service in a register office, and this is perfectly acceptable. There is nothing particularly special about a Witness wedding service, and the important thing is that the marriage is legal in the country in which it takes place.
Most Witnesses prefer to marry in the Kingdom Hall, and unlike other churches, do not have to pay anything for this.
--End Edit--
There is no specific church that former Witnesses attend.
Sort of, The modern day history of Jehovah's Witnesses started in 1870.
No it is not. The Brooklyn tabernacle is a non-denominational church and Jehovah's Witnesses do not participate in interfaith activities.
The Russian Orthodox Church is in the working to minimize any minority religions that are not equal to their own. On account of the Jehovah Witnesses being that of one of the minority religions, yes, the Russian Orthodox Church is, not alone though, behind the persecution of the Jehovah's Witnesses.
Of course they can - it is encouraged.
The religious group and church is named "Jehovah's Witnesses".
Kingdom Hall of Jehovah's Witnesses
No, all work is voluntary.
Since there are over 6 million active Jehovah's Witnesses in the earth, no one has "stomped" out the religion. Interestingly, the current pope has a cousin that is one of Jehovah's Witnesses.
Kingdom Halls are associated with Jehovah's Witnesses.
Seventh-day Adventist Church adheres to worshiping on Saturday, which they observe as the Sabbath day.
It is illegal to do any sort of subliminal messaging any were, and I would say that it is to me more illegal to do it at church then anywhere else. That said Jehovah's Witnesses do not use subliminal tames in church or anywhere else.