Hi Pat,
Your latest information makes it obvious which records on Ancestry pertain to your great grandfather. His family was on the 1900 census living at 360 B Street in Oakland and included Manuel at age 37 born in Portugal; his wife Mary, age 26 born in Portugal; his son Manuel age 12 born in Hawaii; and daughter Mamie, age 10 born in California. It says Manuel worked as an Iron Moulder.
I found that several trees (37) on Ancestry have your great grandfather and most have his death information correctly as dying 25 Apr 1936 in Malaga, Fresno, California. Unfortunately, some have accepted an irrelevant hint for a marriage that took place in 1897 in mainland Portugal from the "Portugal, Select Marriages 1670 - 1910. This is the Manuel that was born in Arengoes; not yours. I think that any reference you see suggesting that your great grandfather is from Arengoes, or that his parents are Domingos Baptista and Maria da Piedade, are based on this record for a different Manuel Baptista and should be disregarded. By the time this Manuel Baptista got married in
Reguengo Do Fetal, Leiria, Portugal, yours was already living in Oakland with his wife and 2 children.
I hope you find this helpful.
Bill Seidler