[Hope]

Why are you so certain of his existence when there is no evidence to support it? Are there any testimonies? Allah does not engage directly with His creation....the communication flows through a chain from Him to Gabriel, then to the Prophet, and finally to the people....

This what we call blind faith...Allah does not talk to his people!!

Allah created us to check if we believe in unseen and  following his  commands.

If Allah show himself to us,We would all believe in him.Then there would be no test and judgement day.Every one  including sinners would  want to  go to heaven without any works.
Allah says in the Quran that there are people that even if they saw all the evidence,they would still refuse to believe.Best example is iblis/ Satan.Is he not?He refused to obey him.

If Allah appears now, 100 years later some people will ask the same question again and again , which will break the idea of the divinity of our creator.

Remember Your God Jesus came to earth and lived 33 years ?
How many people accepted him as God during his life time?
Why can’t he come again?