What beliefs would we consider reasonable for a self proclaimed Christian to hold?

[He lives]

The reason I came to this forum was to let everyone know that there is no way to prove that intelligent design or abiogenesis is correct.

This is both false and absurd 

It is neither false or absurd. In case you are not aware scientists have not created life out of inorganic material. abiogenesis has not been substantiated therefore it is a belief. You have stated your opinion and made many false assumptions.

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Science does not have all of the answers. Some people believe that scientists know how life began, but they don't know. There are many scientific hypothesis regarding the beginning of life and none of them are provable. So if you want proof you are not going to find it.

This is true:

Scientist don't know how life began.. Scientists are looking for the answer to how life began, but they don't know the real reason yet.

This is also true:

Theists don't know how life began. But! Theists are not looking for the answer to how life began. And they will never know the real answer, even if scientists eventually work out what it was and share their findings with the public.

Scientists don't know and admit they don't know.

Theists don't know but think they do.

One of these groups is claiming knowledge they don't have, and it ain't scientists.

Thank you for your honest answer. I would only disagree with two sentences "And they will never know the real answer" Eternity is a long time. That is why I do not believe the never part. The other one is "Theists are not looking for the answer to how life began" Many scientists are theists. Theists also want proof. Neither atheists or theists have that proof.