People of other faiths are lost. They do not have the correct message and therefore their is no connection or strong connection to Allah. Muslims who follow their footsteps are lost as well. Islam came as the last message to mankind. And Muslims are ambassadors of that message. Whether you like it or not, you represent Islam. There are those who have converted to Islam just based on observing the behavior, mannerism and conduct of Muslims before them.
Allaah says (interpretation of the meaning):
“Did you think that We had created you in play (without any purpose), and that you would not be brought back to Us?”[al-Mu’minoon 23:115, 116]
“We created not the heavens and the earth and all that is between them for a (mere) play” [al-Anbiya’ 21:16]
“And We created not the heaven and the earth and all that is between them without purpose! That is the consideration of those who disbelieve! Then woe to those who disbelieve (in Islamic Monotheism) from the Fire!” [Saad 38:27]
And to the heedless, who could care less about God and religion and just want to live in this world.
Allaah says (interpretation of the meaning):
“while those who disbelieve enjoy themselves and eat as cattle eat; and the Fire will be their abode” [Muhammad 47:12]
“Leave them to eat and enjoy, and let them be preoccupied with (false) hope. They will come to know!” [al-Hijr 15:3]
“And surely, We have created many of the jinn and mankind for Hell. They have hearts wherewith they understand not, and they have eyes wherewith they see not, and they have ears wherewith they hear not (the truth). They are like cattle, nay even more astray; those! They are the heedless ones” [al-A’raaf 7:179]
So what is life, what is death? how do they fit in the grand cosmos?
“Who has created death and life that He may test you which of you is best in deed. And He is the AllMighty, the OftForgiving”
[al-Mulk 67:2]
Allaah has stated this reason for the creation of mankind, as He says (interpretation of the meaning):
“And I (Allaah) created not the jinn and mankind except that they should worship Me (Alone)” [al-Dhaariyaat 51:56]
So based on that all, can you tell me why it is expected of Muslims to be religious?
Islam is the final message and the truth. And Islam has told us that this world is but a fainting moment in time, a mere test to see which of us are worthy to be in His grace and which of us want to follow our own little desires. We have the message, we know the truth and therefore it is we who are expected to act on it and own up to it. The previous generations of Muslims have set examples for the world to see what a true Muslim is like. One who stands out with his principles and way of life, not one quick to imitate and blend among the kuffars. We are expected to be religious because others see how committed and displined Muslims are (those who commit to their deen) and that is the status quo they judge rest of us with. That measuring stick is the real deal. All these cultural Muslims are the ones who have deviated from that. The close you are to Islam in implementing it in your life, the more true you are to that label of being a "Muslim".
What you have before you in your family is an example of people who are heedless and away from Islam. Dating and going down the haram path will not be healthy nor have any blessings in the its actions. You're parent's parents neglected to do their islamic duty and teach your parents proper Islam and the result is before you. You parents denied you your islamic right of being brought up islamic and giving you proper Islamic education, therefore you have a secular and cultural life.
So now the question is, will you keep going through life like nothing is at stake here? Muslims understand our eternity is at stake, which is why we strive to achieve that and stick to the deen. Will you make the effort to learn and understand your deen? More importantly, will your kids be secular so much so that no one can tell if they are Muslims or kuffars? or will you give them their islamic right and give them islamic education? These days it's easier to do that by sending them to Islamic schools.