@insieme I have read the whole thread, and thank you.
I am an atheist. I grew up in a Christian community but I became agnostic in my teens, then atheist in my 20s. Most of my family are agnostic or atheist now.
I was once told by a priest on Twitter that not bringing up my daughter in a faith was the equivalent of neglect. 
Like you I struggle with the Big Bang etc, and my daughter asked me, what was there before? When I said, nothing, she persisted in saying, yes, but what is nothing? I said that even the greatest physicists don't know. There might have been something, or nothing at all. We just don't know.
Whilst science cannot explain everything do you wonder that Creationist theory makes explaining the beginnings of the Universe a bit simplified, wrapped up and tied with a bow? Shouldn't the point of human endeavour be to find out with evidence how life began? And why? I mean, that's where physics and philosophy collide, I suppose.
I am fine with the concept of Nothing. I can see why some need answers. My daughter is Wiccan, by the way. 
On other matters, how does your congregation know for absolute sure that gay members of your flock are celibate? I cannot imagine they are surveilled 24/7. I am always suspicious of anyone who says they have stayed celibate, as it's a natural human urge. Therefore, why did God make them gay with urges only for Him to deny them? Seems an odd set of circumstances to me.
I also struggle with a loving God punishing his followers for supposed sins. It sounds abusive to me. Love me, worship me, but if you put a foot wrong I will punish you, and when you die you will go to Hell. Hm. It doesn't leave much room for the flaws of human nature does it? Why create humans with flaws in the first place? Must humanity constantly struggle to be as perfect as God? I therefore reject God as perfect. He is as flawed as humanity.
I think that most humans aim to be good. It's a basic aim, with or without religion. If I was run over by a car, I would expect other humans, religious or not, to ring an ambulance and attempt first aid. We know that adultery is wrong, we know stealing is wrong, and so most humans don't do these things. It depends on upbringing, certainly, and environmental factors, how willing you are to help others, but we all have in-built morals. So I reject religion on those grounds too. My family, my community, my peers, my work and life experiences inform my morals instead.
Is it hard being Christian in a country that is becoming increasingly secular and atheist?