What brings you to this conclusion?
I'm not a religious person in anyway. And by saying that, I'm not JUST saying I'm not Christian or Catholic. I'm also not Taoism, Buddhism, Shinto... not whatever. But at the same time I'm not an Atheist as well.
1. I do not believe a single entity created life and the universe.
But I respect people have their beliefs, no matter which religion.
2. In a number of religions, they claim their God is The One True God and
others are fake.
I strongly disagree with that thinking. You can root for your own belief but there is no reason to "step on" other's belief because of your own said otherwise.
While I do not believe in divine entity, I also understand that there must be a reason why people all over the world believe in different ones.
Because of the reasons stated above, IF I HAVE TO believe there is God, there should be MANY instead of ONE.
EDIT:
I always have similar discussions with two of my religious friends that happened to be Scientist, of sort, yearly. Both of them are the most "sensible" Christian I know because of millennium old Religion Vs Science argument and they are "stuck" in between. They take extra care to explain when I have "queries" instead of just saying "Because God".
I added the EDIT part to explain that I would love to continue, but it's 2am for me and I just got back home from drinking and really must head to bed.
PS: Pardon my grammar and typo in this post. I'm really out of it now and need to head to bed.