So, to wrap up.
Design can not be asserted, it has to be demonstrated.
Just because something 'looks' designed, does not mean it is.
OP asserts design, but does not demonstrate how he detects design, other than, "I presuppose a god that designs things exists. Therefore, design exists. Therefore, when I see something that I can't explain, other than my presupposed god is responsible for its design. Therefore, a god exists".
OP us unable to detect a problem with this line of 'reasoning'.
Design can not be asserted, it has to be demonstrated.
Just because something 'looks' designed, does not mean it is.
OP asserts design, but does not demonstrate how he detects design, other than, "I presuppose a god that designs things exists. Therefore, design exists. Therefore, when I see something that I can't explain, other than my presupposed god is responsible for its design. Therefore, a god exists".
OP us unable to detect a problem with this line of 'reasoning'.
You'd believe if you just opened your heart" is a terrible argument for religion. It's basically saying, "If you bias yourself enough, you can convince yourself that this is true." If religion were true, people wouldn't need faith to believe it -- it would be supported by good evidence.