My biggest question is why didn't Jesus, even when He was here, make it obvious that He was truly God?
It seems to me that Christ did make it obvious that He was truly God. How many people do you know that said, "I Am," claimed to be the only Son of God all mankind can be saved through, prophesied his own death and resurrection, accomplished it, taught His followers about the Trinity, prophesied they'd receive the holy Spirit, and then accomplished that too? That doesn't leave me much room to doubt.
He never directly answers anyone when they ask and always does just little miracles that still leave room for someone to doubt.
It does still leave some room though, you're right. The thing is, there is always room to doubt. God could show up in the clouds today and tell each one of us exactly what He wants us to do, and many of us would hate what He is telling us to do so much that we would convince ourselves He is the evil one.
Why didn't He and why won't He (If He came back again) do something absolutely 'amazing' or 'showy' like make it rain cupcakes or move a building without touching it etc. It's just like He always leaves it up to us to decide if He really is God and leaves us with barely enough evidence to believe He is and too little evidence to entirely crush all doubt.
You seem to believe that you would never reject Him if he made cupcakes fall from the sky for you. However, He knows you better than you know yourself if He really is.
Consider this: sometimes the way to train a dog to be more obedient to the master is not to always grab him by the ears, put your nose to his, and yell at him. Sometimes gentle nudging is the better way. God will reveal Himself to you if you ask Him to. It probably won't be in the manner or time that you probably will expect, but I promise you this: If you seek Him with all your heart and cry out for Him from the depth of your soul... you will find Him.
Many of us humans called Jesus Christ evil even though He came bringing miracles, healing, wine from water, and forgiveness. We called Him evil for the times and manner in which He healed, for the types of people He forgave, for the "vile sinners" He associated with, and for the substances He put in His body. Many of us would do the same thing to Him today.
But if He did something like this then everyone would fall on their knees and worship Him.
I respectfully disagree. God has done absolute, without-a-doubt miracles in my life. And I've still doubted and even disobeyed Him... too many times. The thing is, even after God proves Himself His same difficult commandments remain. Parts of us hate Him intensely and much of what He stands for, whether we know it or not, and we talk ourselves out of Him. Demons even try to influence our thoughts so we leave Him. Unfortunately, it almost seems as if we're wired to disobey Him sometimes. We're not. We were created to obey Him. And we can. But God is Spirit, and learning to obey God is a spiritual process. He can manifest Himself to us physicially, but that doesn't always help us obey him spiritually as much as we assume it will help.