I think you ask some great questions so don't feel the need to apologise. Also, as you don't know me personally you can only gather an idea for my reasons for faith from a few points gleaned from messages (and I'm not much of a writer!!)
OK - taking each point in no particular order...
On the God/Parents question - the Freudian logic that I only believe in God because there are times in my life when I have really needed Him. That same logic would have me denying my parents existence as there are times I have needed them!!
On the question of the miraculous, I can only share one from personal experience, and leave you to make of it what you will..
My brother had a girlfriend when he was about 17 who had some very severe back trouble. She had a twisted spine and was given till her mid 20s before she would wind up in a wheelchair. She lived a few hours away from us and had come to visit with her friend for the weekend. That particular weekend Jim Sepulvida was sharing his experiences at an auditorum near to us and we had all wanted to hear him speak so we went.
Just to mention, this was 25 years ago and Jim is no longer with us but I found a YouTube video of his testimony.
Anyway, at the end of the meeting, he went into a time of praying for the sick. Various people had gone up to the front but she didn't. There was a pause and Jim stopped, saying that the Lord was telling him there were five women there with back trouble.
Four came forward...
Jim stopped and said there was still a woman with back trouble that needed to come forward. She told me afterwards she thought at that moment 'I'm 17 - that means I'm a girl - it's not me'
Jim paused, then said 'OK, will the GIRL with back trouble please come forward!'
She did.
No-one touched her and she was certainly not a regular at 'that' sort of church, but as Jim prayed for her she fell backwards and looked like she wad fast asleep!!! When she came to after a little while, she was smiling from ear to ear and ran up the steps to us, then round the hall again... When she had calmed down a bit she told us that she had felt the love and presence of God and had the physical sensation of her spine being knocked into line!
Returning the doctors she had a series of tests and was pronounced inexplicably healed.
I'm at the gym now, but I left your Bible authenticity questions unanswered so I will give you my response on that later on if you like?