The First Cause? Prime Mover Argument

[Neo-Scholastic]

There is nothing illogical about an infinite series.  For example, consider the set of whole numbers (....,-3, -2, -1, 0, 1, 2, 3, ...).  There is no first whole number and there is no last whole number.  In the sequence, one finds the next whole number by adding one to the previous one (or one can derive it that way).  Or one can derive the previous number in the sequence by subtracting 1 from the succeeding number.  There is nothing contradictory or illogical about this.

You flunk logic with premise 2.

It is only seems logical to you because you have not differentiated between a potential infinity and an actual infinity.