so what do you want us scientists ant atheists to do speculate without data.
Sure Thor, Perun, Osiris, and the pink unicorn pulled together their power before the big bang and made it go bang. there is no data that they did and no data that they dint, and even no data that they exists
or you can go the universe will at one point expand so fast that it brakes the speed of light witch will cause all matter and energy to condense in one small funnel that will eventualy brake the time and place barrier and go bang 15 billion years ago at the same time and place our big bang went bang
you can speculate all you want without data or evidence but its all speculation