Now claiming full belief in the Gospel as the Word of Jesus, you must accept this directive also but where would you be able to find the teaching of this sacred tradition and the apostolic succession to provide it? The Gospel says it must be done.
There is only one place that can possibly provide these three articles and without the three together, you are not getting the fullness of Christianity. Whether you accept it or not, whether you want to agree or not, you can not with good common sense justify accepting and believing in the Gospel but not the additional articles the Gospel itself tells us to follow.
Sacred Tradition backed by the OT and NT teach us of the Assumption of Mary, but you haven’t learned of that yet.
However…
You believe in the Gospel as the written Word, This is part of that word;
There are also many other things that Jesus did, but if these were to be described individually, I do not think the whole world would contain the books that would be written. (John CH: 21, v 25)
11 Therefore, God is sending them a deceiving power so that they may believe the lie, 12 that all who have not believed the truth but have approved wrongdoing may be condemned. 13 But we ought to give thanks to God for you always, brothers loved by the Lord, because God chose you as the firstfruits for salvation through sanctification by the Spirit and belief in truth. 14 To this end he has (also) called you through our gospel to possess the glory of our Lord Jesus Christ. 15 Therefore, brothers, stand firm and hold fast to the traditions that you were taught, either by an oral statement or by a letter of ours. 16 May our Lord Jesus Christ himself and God our Father, who has loved us and given us everlasting encouragement and good hope through his grace, 17 encourage your hearts and strengthen them in every good deed and word. (2 Thessalonians CH: 2, v11-17
now again, unless you totally disregard these authentic scripture verses, see if you can answer each of the questions honestly.