[Potowmack]

So the teachers should teach that there had to be Someone who caused everything to happen.

No, that's not necesarily a true statement.

What if the universe (in one form or another) has always existed?

Our monkey brains have a tough time grasping "infinity," but it's a possibility.

[Hill of Tara]

how did it always exist? that's not a logical concept. everything has to have a creator or catalyst.

[metmom]

What if the universe (in one form or another) has always existed?

Einstein's Theory of Relativity already addressed the issue. It has a beginning.