Just because water is found in Mars, it doesn’t mean it becomes favorable for variety of life forms as found on earth. Even when earth is favorable for variety of life forms, still “more than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth's current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described.” (https://en.wikipedia.org/wiki/Extinction)
Even if life may have been seeded there on Mars by some aliens (as documented in the film Expelled, Richard Dawkins, or as implied by panspermia proposed by Francis Crick and Leslie Orgel) who will create provisions for sustaining those lives?
What Isaiah wrote still holds weight: "God Himself that formed the earth and made it .... He formed it to be inhabited" (Isaiah 45:18)"