You don't accept (believe in) the Trinity or the Nicene Creed by your own profile
Right. And?
Yes. And? Acceptance of an ideology does not validate that ideology as truth.
The Nicene Creed states what I believe
A 4th Cent. "creed" invented by the prevailing catholicism at the time. It is error, and can be shown to be in error from scripture. It is not that difficult.
and it doesn't use a single quote of scripture to do it
Exactly. It violates Isa. 8:20; 1 Pet. 4:11.
... it just states what is believed without trying to justify or confuse it by endless quotes that don't really state what the belief actually is.
What it does is simply make up its own terminology, and in so doing, errs. The Nicaean "creed" is clear in what is to be believed by the adherents in a 'hard logic' (written statements, computer language). All who did not agree with that 'logic' were eventually anathematized.
Can you do the same for what you believe
I present to you and all - the Bible. The Bible is the only 'creed' ever needed. Seventh-day Adventists are non-credal (man's).
, just state your personal Creed
Again, that is your own (personal) chosen way, and not one found in scripture. I have no "personal Creed", as that would violate scripture, and even Jesus' own example.
of beliefs as simply and clearly as the Nicene Creed does for those of us who believe it?
The Nicaean Creed is erroneous, and can be shown from scripture to be so. People "believe" all kinds of things, even as they did in the days of Jesus Christ, as He walked this earth. This did not make their man-made traditions truth. Those man-made statements were found to be in contradiction to Him Who is the Truth (Jhn. 14:6), and His word (Jhn. 17:17).
What is interesting, is that persons (such as yourself, but not only yourself), will point to some man-made document / statement, that has
no claim to inspiration from God (such as a Nicaean creed), and look past the heaven inspired words of God that has always been with God's peoples. My suggestion, to you (and all), is to cease from looking to the earthly, and look instead to the heavenly.
Exo_20:22 And the LORD said unto Moses, Thus thou shalt say unto the children of Israel, Ye have seen that I have talked with you from heaven.