My case against Creationism and Infinite regression

[Spinchance]

Does "God" have any effect, however miniscule, on the Universe whatsoever (answering prayers or petitions, manipulating causality to cause miracles etc)?

If "yes", then that effect ought to be at least detectable, if not measurable. Otherwise how can you possibly even suspect it happens at all?

If "no", then this god can safely be ignored as irrelevant to the Universe altogether.

Would you assume the method of God answering a prayer/petition to be the same each and every time? 

God does not answer prayers, God is Omniscient: he needs no prayer, because He already knows what you want. 

The purpose of prayer is asking God to do what he would do anyway. 
So whether you pray or not, things will happen just as they would if you didn't pray. 

But if you believe that you can change God's mind, then you believe He is imperfect. 
If you believe that God can be influenced, than the God you believe is an Idol created by your mind and you are an idol-worshiper.

Prayer is the only industry in which failure is entirely the fault of the end user.