Life comes from existing life. That fact has been proved by science. - Vidqun
Yes life does comes from existing life but there was a time that earth contained no life.
Originally life emerged from non-living prebiotic conditions. Exactly how that happened is still an unproven hypothesis. It will be solved.
Here are the requirements for the origin of life...
1 - A continuous supply of reactive carbon for synthesising new organics.
2 - A constant flux of free energy to drive metabolic biochemistry - the formation of new DNA, amino acids & proteins.
3 - Inorganic catalysts
4 - Removal of the waste product of chemical reactions
5 - Compartmentalisation - a cell-like structure to allow the accumulation of products and separate them from the outside environment
6 - Hereditary material - RNA, DNA or equivalent
All of these conditions were found in Alkaline hydrothermal vents under the Hadean oceans 4 billion years ago. The details are being investigated by microbiologists and geochemists. It will be solved. Where will god hide then? Cosmology?
Edited to add - Of course DNA was not "found" in hydrothermal vents 4 billion years ago. Explaining how RNA formed in that environment is one of the challenges.