Hmm, this is a clear case of argument from incredulity in the form of:
1. Things are complicated in reality
2. Nothing complicated could form without an intelligence guiding it
3. Therefore God exists
1 is fairly easy to agree upon, but 2 makes a jump because complicated things form in nature all the time without an intelligence guiding them. Snowflakes for example or even salt crystals. We have a good working theory for both provided by science. 3 is the major sticking point because if God exists, why do you presuppose YOUR God? As other members have pointed out, why NOT Odin, or Azathoth the blind idiot god in the center of the universe? They are just as plausible as YHWH or Allah the moon god transformed to the current "the one" in the mythos of Islam.