I am a Christian,
For the Christian, our lives purpose can be summed up through the Bible in this particular passage, "...Fear God, and keep his commandments: for this is the whole duty of man" (Ecclesiastes 12:13 KJV).
You wrote that most things that those who are religious see as divine is explainable by science. Really? Science cannot tell you where you or the origin of life on earth. Yet, you believe science has all the answers!.
If you believe in evolution in that man naturally evolved, then you believed the hype. Evolutionists believe that life started by itself. This is a scientific falsehood. According to science, abiogenesis or spontaneous generation has been proven over, and over, and over false. Scientists have been convinced that life COULD NOT have started by itself. Scientists do not have even a theory anymore that life started by itself.
It has been proven countless times that life comes from life. God is life and He created all life. Scientifically, this is accurate. Life coming from non-life is not accurate or valid nor is it scientific.
You say there is no evidence of God. You are very wrong. The Bible is evidence of God. God wrote the Bible through men to not only acknowledge to man that God exists but who God is.
Test the Bible. I know you have not done so. Test the prophecies of the Bible. There are over 300 prophecies of Jesus Christ. Jesus said He has fulfilled every one of those prophecies. See if that is true.
Test the archaeology of the Bible. The ruins of Sodom and Gomorrah was still there at the shores of the Dead Sea. The metal carcasses of the Egyptians chariots that pursued Moses into the Red Sea are still there. Those metal parts are found in the Gulf of Aqaba which on ancient maps was also known as the Red Sea. The walls of Jericho are still on the ground in ancient Jericho city.
Do you know that the only book in antiquity that identifies the Hittites is the Bible? Do you know that the Bible was laughed at for centuries by those who thought the Bible made up people and cultures? Do you know that in the late 19th century, the capitol of the Hittite Empire was found in an archaeological dig in Turkey?
Test Jesus Christ. Jesus Christ was The Son of God. Jesus Christ was also God-The Son. There is an empty grave in Jerusalem and it is still there. Even the enemies of Christ in the very day He lived do not dispute that Christ's grave is empty. Even Christ's enemies did not dispute the miraculous powers of Jesus Christ.
Test the scientific principles of the Bible. How did the Hebrews know when to circumcise a male child on the 8th day? On the 8th day of birth, a male child's resistance will be the highest that it will ever be for the rest of the child's life. How did the Hebrews know this? The Hebrews knew this for God told them.
How did the Bible know that the earth was hung on nothingness? The Romans and Greeks thought that Atlas carried the earth. The African thought that the earth rested on the back of a great tortoise. The Bible was again right. Job 26:7 King James Version (KJV): He stretcheth out the north over the empty place, and hangeth the earth upon nothing.
It was the Bible that first said that the earth was round. Isaiah 40:22 King James Version (KJV): It is he that sitteth upon the circle of the earth.
Test the sanitary laws that the Hebrews and Jews obeyed. As a result of their obedience, the Hebrews and Jews never suffered from a plague or widespread disease. Yet, plagues and pandemics are found on nearly every continent of man and in every civilization of man.
Oh, there is plenty of proof of God and you have lied. Further, since you have lied, I do not believe for one moment you would have volunteered for World War II. Why would an atheist volunteer for a war that he might be killed. For the atheist, living on earth is all there is. For the Christian, there is life beyond the grave. The atheist do not believe in God so this world for the atheist is all that they have. Tell me why an atheist would put his life on the line? I do not believe you and its makes no logical sense.
Furthermore, how do you arrive at God being a creation of man? Past histories have shown that mythological gods do not last long. Roman, Greek, African, and etc., religious cultures come and go. Between Judaism and Christianity, God has been here from the beginning some 6,000 to 10,000 years. Further, if man made up God, why does not man continually change God to his liking? Why have the idea that man would ever go to hell for being unfaithful here on earth? Why have wives having equal rights within a marriage? Ephesians 5:21 KJV: Submitting yourselves one to another in the fear of God. This scripture is regarding a Christian couple in marriage. Husband and wife must submit to one another. Why not have man to be the head of the wife and let the man rule without constraint? Yet, the Bible say the husband is the head of the wife and the head of the husband is Christ. Husbands have to answer to Christ for the treatment of their wife by the husband.
Through close examination of your life as you put it out there, I can see that you are drowning in atheistic nothingness. The Christians have duties to do that will lead them to happiness.
In Christ's name