I remember related story that when asked, the holy prophet (pbuh) answered that even he is not guaranteed paradise and that it is with the Mercy of Allah that he will enter paradise.
So if there was anything to be taken from this narrative, is that we must seek His mercy.
Just to give another related incident (from what I am informed that it is an authentic hadeeth) about the prostitute who used her shoe to give drink to a thirsty dog and entered paradise.. so it is about your 'being' that will get Allah's mercy...
If you were to reflect on the passage you would read daily in your prayers, you would ask 'ihdinahsiraatalmustaqeem' meaning that you ask regularly to be guided on to the right path.. indicates that you can be guided (or misguided) at any time and that the most important thing (in my opinion) is that we die in the state of imaan.
I hope this gives you some points to consider against the 'sect' concerns you have... Believe me I had similar thoughts too! Only I when I looked at it (because I was informed that the Jews will have 1/71, the Christians will have 1/72 and Muslims, 1/73. My simple mathematics indicate from all the people of the Books, 3/216 will enter paradise (that is a hopelessly low statistic for 'winners') and if i were to link this to Satan v Allah, the result would appear very lopsided indeed (and in my mind Satan wins!) and it really disturbed me.
But the prostitute story gave me hint that I have absolutely no knowledge on how Allah would do His Judgment (who would win and who would lose). So, as what Rasulullah has said, we depend of Allah's Mercy. So let us pray for His mercy and constantly seek His guidance to be on the right path.

eace: