As far as I know I answered to all objections, but maybe I have overlooked some. Which objections do you have against the following statements?

1. There is no scientific reason to believe that everything has a cause.

2. In fact there are physical events without cause (Bell's theorem).

3. The universe may have had an internal cause (f.i. multidimensional membrane collision) or no cause (f.i. spontaneous phase transition).

4. The universe is not infinitely old, but the space/time continuum it emerged from may be infinitely old.

5. The size of the universe may be infinite.

All of the above is consistent with scientific theories. 2) and 5) are even supported by observations.