I believed the Watchtower at one time, then clung onto belief in God for a little while after I left the WTS.
Now, I don't believe in God. I have no faith in him at all.
Having faith doesn't really mean much - you can't just will God into existence with your faith. Similarly, if God does in fact exist, atheists saying 'there is no God' wouldn't make a scrap of difference. He either exists or not.
^^^ Objective reality.
Another thing is this: how could you conduct an investigation into the possible existence of God? There are no tests you could do, no data to collect to try and answer the question.
If there is a God or an afterlife, I'll find out on my death bed. What I won't do is waste my life trying to find him.
I have a finite time on this planet and I should put that time to good use - it would be silly of me not to do so.