Atheists, what are the most convincing theist arguments you heard of?

[Whateverist]

Possible conclusions to draw based on the premise I've bolded:

1)  Therefore the prior causes go back infinitely.  Implication, there could be no first mover as it too would require a cause;

2)  If the causes do not go back infinitely, then there would need to have been some first causes .. possibly even just one;

3)  It is impossible to know whether the number of first causes is zero, one or many.  It is also impossible to know whether first causes -if they exist at all- are natural processes or agents.  Therefore, based upon contemplation of possible first causes it is possible to deduce absolutely nothing regarding the nature of the universe(s) or its causes.

Not mention these idea's only apply  to our experience of the current universe. It's wholly unfounded to think this has applied forever. There is no reason to assume there is any such thing as a first cause only that there are causes  in the here and now.

Yep, it is therefore a flimsy basis for arguing for what are absurd sounding claims.