For me, losing my faith in the JW religion ultimately caused me to lose faith in God, although it took me a number of years to complete the process. Once you start questioning most of what you so ardently preached at one time, how do you stop at just the religion? Why would you? I felt I had to to look at everything, not just the Watchtower doctrine, and when you look at belief in God with the same critical thinking skills you used to determine the Watchtower was false I believe you can only conclude that belief in God is just as false.
I am not anti religion, as I believe it does fill a need for some people, and not all religions are as bad as the JWs, so it's fine by me if someone believes. But all major religions teach things that contradict known facts about science and the world, so don't pretend there is any logical, rational reason to believe in God, because there isn't. I look at posts by people who switch from the Watchtower to another fundamental, conservative religion and I wonder why they bothered to leave the Watchtower in the first place.
However, some of them became very aggressive against me. One of them, after leaving the Watchtower Society went to a divinity school to learn Christian theology. This guy was one of the most aggressive, which means that his Witness fanaticism remained in him. He thought that his Bible knowledge learnt from that divinity school turned him a superior Bible interpreter. In fact, what I realized is that those theological schools are schools of quackery, where you have to learn sophisms to defend the Bible contradictions.
I am currently reading a book about the Clergy Project. It's a program to help those clergy who have lost their faith in God. Some of what they go through is similar to leaving a cult like the JWs. They have a lot invested in their profession and most every one they know is of their faith. It can be very isolating and there can be a lot of criticism from the church hierarchy. Like any organization there is considerable pressure to maintain the status quo and hostility when they don't back down. Of course theological schools are full of quackery, how else do they convince otherwise intelligent adults to believe in fairy tales and teach them to others? But I think they are having a harder time of it these days.