JustRish,
The very fact that you are open to the idea of existence of a Creator means that you are a Theist. That is my honest opinion.
Regarding interference of Krishna, there is not need for Him to personally interfere but because He wants to give His association to His pure devotees and increase the devotional sentiment among the Theists He Himself descends (Avatara) to the material world.
That's what the famous verse "Yadaa Yadaa Hy Dharmasya..." mentions.
As stated by Krishna:
yada yada hi dharmasya
glanir bhavati bharata
abhyutthanam adharmasya
tadatmanam srjamy aham
Whenever and wherever there is a decline in religious practice, O descendant of Bharata, and a predominant rise of irreligion--at that time I descend Myself.
paritranaya sadhunam
vinasaya ca duskrtam
dharma-samsthapanarthaya
sambhavami yuge yuge
In order to deliver the pious and to annihilate the miscreants, as well as to reestablish the principles of religion, I advent Myself millennium after millennium.
- BG 4.7-8 (http://www.asitis.com/4/7.html http://www.asitis.com/4/8.html)
Hare Krishna!