Don't you see what you're saying? You say "MAY have allowed"....or maybe not!...even by your own admission. We know God created rainbows, clouds and trees. If we want to look for reminders of His presence then why not look at things that are real reminders of His presence?
For a moment consider...if this is just a smudge, then doesn't it seem irrational to make it the focus of anything? Do we really need an accidental smudge to be brought closer to Christ?...and if so, what does that say about us?