Questioning and Seeking Clarity

Assalamu alaikum, I'm a Muslim alhamdulillah, though lately I've been grappling with ongoing uncertainties about my deen. Honestly, I haven't found any faith as rational and consistent as Islam, but I've often felt pulled toward atheism because I wrestle with fully grasping the reality of Allah. The main struggle comes from not consistently seeing my du'as answered. Truthfully, there have been many times when my smaller duas were fulfilled, yet I sometimes dismiss them as coincidences for some reason. I also find it hard to accept certain ideas like eternal punishment in the hereafter. So I'm just navigating some heavy doubts in my iman. I understand arguments like "existence must have a creator," but are there other solid reasons explaining why atheism is considered illogical and unconvincing?