You've really expressed your feelings well in this. The emotions are so raw and powerful.

Just a few suggestions:

Last line 1st stanza -
Should be "So why did God forsake me?"
or "So why has God forsaken me?"

in the 2nd stanza -
And I sit and night, cry,
should be "I sit at night and cry"

Wishing I'd died - should be "Wishing I had died"

In the last stanza - your should be "you're" or "you are".
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That will fix the grammatical things. It reads very much like a letter, which is fine, but if you want it to be more poetic, then there are ways that you can revise the lines to do that.
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Now, I must comment on the content and I hope you do not take offense to this.

I did appreciate your warning, for I do believe in God and my faith in Him is what drives me. I in no way took offense to your writings as I have felt some of the same things in my life at different times.

I do not hate you for writhing what you did, and it really irks me sometimes when Christians/believers/whatever people want to call themselves, jump down someone's throat for expressing negative feelings toward God.

I'm saddened that things in your life have driven you away from God, but you must follow your heart and your conscience.

If you need to talk about anything or would like help on any of your poems, feel free to PM me.

~Ann Marie

Thanks for the comment!
And the fixing of the poem :)