Why should God be any more believable than the Tooth Fairy?

[BIG NIGE]

Seriously, what's the difference? The tooth fairy was made up to make kids feel better about losing teeth; God was made up to make adults feel better about their purpose in life and their reason for being. However the bottom line is that they were both made up and anyone who employs rational thinking should have little trouble figuring this out. Only little kids believe in the tooth fairy; adults know it's just a made-up story. So how is God any different? The stuff in the Bible about creation and heaven, it all defies rational explanation, just like the tooth fairy, so why do people belive in it?