♥How do you know God exists? ♥What was it that convinced you and continues to convince you?
♥Are you sure?
♥How can I know God?
Personally I always believed there was a "creator". I came close through some periods of thinking maybe there isn't but I never said it in my heart.
The Bible convinced me that the God described within is real and the true God. It's what I turn to when I doubt or need reassurance and it never fails. Once I believed, placing my faith in Jesus and the gospel to save me things started to become more clear. Gradually I became more and more convinced. There's still sporadic doubts out of nowhere but they're fewer as time goes on.
Romans 1:20 says that within us is the knowledge of God existing and I believe it. Romans also says that our faith comes from hearing the Bible and the gospel.
Your last question is important. I'm going to get a bit personal.
You can know God by faith. Aknowlege your sin and realise there's a penalty, Hell. You will go there if you are not saved. Hell is eternal punishment...
However there is
good news, Christ Jesus came into the world to save sinners. You can be saved by faith. Placing your trust in what Jesus did to pay for your sins. Rest upon God's promise.
John 3:16 says For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
God loves you and wants you to know him, to know you are saved. All that's required is that you by faith, ask God.