NO.
Coffee does not cause stomach cancer.
Many people drink coffee daily and drink coffee for many years and they never get stomach cancer.
If coffee caused stomach cancer everyone who drank coffee would get stomach cancer which thankfully they do not.
My Grandpa drank coffee for over 70 years and lived to be 90 years old and never had any cancer including stomach cancer.
Drinking coffee in moderation can actually benefit your health and may prevent some cancers as well as heart disease, heart attacks, strokes etc.
Drinking coffee has also been shown to possibly prevent dementia as well.
I drink coffee daily as well and will continue doing so because I cannot do without my coffee.