Well, cus animals are smarter than this lol.
God, in my humble and a bit offending opinion, is a concept meant to help the miserable get through life.
I know some individuals with miserable life. What helps them keep going? The idea that there is a heaven waiting for them after death where they can enjoy the best possible existence ever where they live every enjoyable thing they wanted in this life but never got to.
The poor will imagine finally being rich in haven, the ill being healthy, the old becoming young, the lonely being in love...etc. everyone imagine heaven as the place where their wishes finally come true. It's a painful thing to see people cling to the idea of God. They're hopeless against life unforgiving nature and thus need to feel safe, protected, and watched over by something that is loving and compassionate and all powerful. They, from the bottom of their heart, want God to be real.
Haven't you all watched videos of some moms who have lost multiple if not all their kids in the current Palestinian crisis? Some of them are "accepting" of what happened cus they believe their kids are now in heaven and they will get to see them later when they die too. Imagine the sorrow they would feel if they didn't have such a belief.