To LifeIsGood...
Rather than say why I believe in 'God', I will say this:
I believe that someone created humans and life and this planet and this universe...
So, if that someone is 'God' then that's who I believe in.
I believe that the Creator is present and I see evidence of that everywhere I look.
What the big plan is or all the ins and outs of it are things I am trying to explore right now.
I feel that the Creator loves humans and regardless of the ups and downs in my life,
I know that there is definitely someone there that knows me, understands me and cares.
Hopefully, that somewhat answers your question.