after death there is something called "
البرزخ" ... which is a transition phase between the life and the after life ...
بسم الله الرحمن الرحيم
{ومن ورائهم برزخٌ إلى يوم يُبعثون} [المؤمنون:100]
صدق الله العلي العظيم
وعالم البرزخ هو عالم القبر، وهو عالم المثال الذي يعيش فيه الإنسان بعد موته إلى قيام الساعة. و هو أمر بين أمرين، وهو الثواب والعقاب بين الدنيا والآخرة، وهو قول الصادق ع: والله ما أخاف عليكم إلا البرزخ. وجاء عن علي بن الحسين(ع) : القبر إما روضة من رياض الجنة أو حفرة من حفر النار
This is cocerning the question ... من دون ما نفوت بمتاهات عذاب القبر
As for Tawa i can see he is somehow confused ... first he said he is going straight to hell, then he doubted the presence of heaven and hell, then in another thread asked God why he left him, then he doubted the presence of God ...
but finally he resumed everything by saying:
"sometimes I feel that God is there, and sometimes I feel that it's not true at all... ma3 2enno bi2oolo 2enno l'2ensein leizim yshakkik bi wjood allah yerkemil ykoon mou2min, la2anno mesh mazbout 2enno l'wa7ad y2eimin bi allah 3al 3emyeineh... I don't know ... 
"
which is something similar to : "To believe in God or in a guiding force because someone tells you to is the height of stupidity. We are given senses to receive our information within. With our own eyes we see, and with our own skin we feel. With our intelligence, it is intended that we understand. But each person must puzzle it out for himself or herself."
Sophy Burnham
each person must puzzle it out for himself (that's the bottom line) ... i can't make you believe in God or heaven or Hell ... but i'm sure every religion has clear points concerning this topic ... I don't know a lot about christianism ... but for me a lot of your questions (Where Is God? ... What Makes You So Sure That God Is Accepting Everything That Is Happening ... What Makes You So Sure That God Will Send The Bad People To Hell??? Have You Ever Seen Someone Who Came Back From AfterLife And Told You About Everything There? IS THERE AN AFTERLIFE???) are answered in the Islamic religion ...
and i'm sure christianism has the answers of your questions ... but they are still foggy for you ...
this is something i read ... don't know if it helps :
"Doubting God's existence is okay and perfectly acceptable within Christianity as long as the person doubting remains obedient and committed to the Christian path."
Preacher
Thank You ...