I have studied some philosophy, but I just put away all my philosophy and apologetic books in order to move. I think there are some wonderful, elaborate reasons why God exists, and cares for us, but I prefer to share my own experience, which has great meaning for me, and has lasted 34 years.
I had a lot of people praying for me to believe, and also witnessing to me. But I did not believe. I was in college, taking science, esp. biology, geography and geology, and I saw a lot of weak arguments for evolution. Like in biology, they told us they date the plants by the rocks. In geology, they told the students they date the rocks by the plants. Some strange circular reasoning, which even as a young person didn't work for me.
Then I ran into quite a few books on evolution vs creation. They lead me to the conclusion that creation was the best paradigm for the reason for the existence for both the earth and the universe. But who was the creator?
So I started with reason, and ran into a DEAD END! Because God requires much more than reason, he requires faith. Faith is defined like this:
"Now faith is the assurance of things hoped for, the conviction of things not seen." Hebrews 11:1
That was something as someone who was UNSURE about faith didn't help me much! And I think it is great that as an UNSURE person, the OP is posting and asking questions.
So for about a year, I searched for who the creator was. I had read the books of many of the world's religions and cults, and they offered no answers for me. So I decided to buy a modern translation of the Bible, and started reading.
Only, I didn't get it! Not at all! I just kept circling things and putting question marks in the margins. The Bible did not seem reasonable and it made no sense.
I gave my testimony elsewhere, but eventually, through the prayers and sharing the gospel by many people, God revealed himself to me and called me to be his child. Now that is not reasonable, but that is the truth! I realized that Jesus Christ was "the way, the truth and the life and no one comes to the Father but by me." John 14:6
I picked up the Bible I had been reading, and it suddenly made sense. I started erasing all the circles and question marks. I had met the Author of the book. Not reasonable, to someone who is unsure, but the truth!
So 34 years later, I am still serving God. The amazing thing, is how he has changed and transformed me into a loving, gentle and kind person, from the very angry, controlling, and selfish person I was. I know that would not have happened without the power of the Holy Spirit working in my heart and life. That is the power of God! And really, the most amazing and reasonable thing, that I never knew about or expected when I first met the Lord.
"Do not be conformed to this world,but be transformed by the renewal of your mind, that by testing you may discern what is the will of God, what is good and acceptable and perfect." Romans 12:2
The word "transformed" here is in the imperative passive tense in the original Greek. It means we are commanded to be changed, but it is God that does the changing - and that starts the moment we meet God and he justifies us. Really, it is another illogical paradox.
"But Jesus looked at them and said, “With man this is impossible, but with God all things are possible.” Matt 19:26
So you can talk about reason, logic, philosophy and apologetics all you want. In the end, it all comes back to God! And unless you are a Christian, that is never going to be reasonable, is it?
Praying for God to reveal himself to you!