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Some claim that god is necessary in order to give salvation
But this argument only holds god if you accept the theological concept of salvation
He shifted attention from the heavens to the heart and encouraged us to find solutions to our problems through self understanding

The god idea is a response to fear and frustrating

Finding no security
They created the idea of gods in order to give them comfort in good times, courage in times of danger and consolation when things go wrong
To this day you will notice people often become more religious at times of crises

Buddhism is not pessimistic, it teaches us to face the reality of our existence