YourbroMoe
For the sake of arguement i will respond to your major hiccups in God.
a) How can God be just & merciful if he will punish severely?
Answer. If u r judging Gods mercy by virtue of giving Harsh punishment, then u r missing the ball mark.
First of all, we are not in Yomul Qiyama where the day of judgement, God will judge. We dont know who will be forgiven, who will be punished, etc etc
Yes, God is merciful, but he has not gotten the opportunity to be merciful, lets wait till the day of judgement. As to Mercy, God is merciful every day.
He has an angel on your right side making sure u r okey. U can breath. The universe does not crumble. U have a body that works amazingly without u paying monthly fee to have to own it. etc etc
Gods mercy is infinite.
But........
I know ....u r hang up on the punishment.
Well.....God is Just. He sent us Quran to guide us. Abdi hebel posted a Yasir Qadhi video up there, i recommend u listen to it.
God is Just because he has warned you, either do this or this will happen. Its not really rocket science. Its not a democratic vote.
Shukram
Salaaam Aleikum