What was God’s plan behind Creation and why does he need one?

I don't believe in an omnipotent, omnipresent being that can create perfection in the blink of an eye. I think the human race is a work in progress by said deity, if there is one.Now the question you pose about being in an inhospitable environment is an interesting one, as I believe that in order to make progress toward a better human race, that human race must be tested under adverse conditions. Much like a car that is crash tested. Yes we are in a sense live, intelligent crash test dummies. Or to put it more accurately, we are the vehicle the crash test dummies are our internal organs, so to speak.To use another analogy of a device created by humans besides the motor vehicle, take computers for instance. In order to make a more robust computer, it must be subject to attack and tested under adverse conditions. you will only find weakness under adverse conditions. If the conditions or the environment is perfect, the weaknesses remain hidden and no progress is made.It is a long and arduous process, with floods, earthquakes, hurricanes, tornadoes, murderers, rapists, fire, lions and tigers and bears oh my! (the list is so long I will not bore you with all that can harm you) But you are being tested, your weaknesses are being found, the DNA changing to improve your chances.Whether this is a natural occurrence or by God's design I do not know. There is yet no evidence of a deity but perhaps said deity prefers it that way. Or perhaps there is no deity and we are all just some sort of cosmic random natural event. I prefer to believe in the deity, but I do not claim to be certain of this deity's existence. Just that it simply makes more sense for there to be one.Think about it, have you ever seen anything so complex randomly spawn without a creator? Have you ever seen a microprocessor assemble itself by chance after throwing a bunch of parts together? Of course not! Someone had to assemble it. Now consider how much more complex life and human minds are to that of a microprocessor and you will see how unlikely it is that humans are just some random event without a creator. Now I'm not saying it's impossible! Just improbable. Thanks for reading. God bless you and may God bless the United States of America.

That would be akin to saying babies live in the womb for 9 months to be better equipped to live out the rest of their lives in other wombs exactly like that one.

How do you explain the first humans on earth? They didn't have a mother's embryo or a father's sperm.

I caught it, but I didn't think it mattered enough to correct it. Whether you believe the first human arrived as an embryo or an egg and sperm separately that then joined together matters not. The original question was where did they come from? The first human had no mother nor father or else it wouldn't be the first. Do you understand the question yet?