Enjoyment of Paradise

The majority of Christians think that our belief in Heaven is just to absorb ourselves in pleasure, to have as many concubines as we can and to drink alcohol, which Islam prohibits on earth. Please tell me how I can refute their claims. Jazakum Allahu Khayran.

Dear scholars, as-Salamu `alaykum. Why does Almighty Allah forbid the believers to drink wine in this world, while He allows them to drink it in the Hereafter? How will He Almighty allow them this in the Hereafter though it is extremely harmful? Jazakum Allah khayran.

Salaams respected Scholar, I have an issue regarding supplication (dua). After every Fard salaah I ask Allah (SWT) to bless with countless wives in the Jannah, on the condition that I enter Jannah firstly.My question is: Is such a request valid? The reason I make such a supplication is because I really want to prepare for the here-after and if I am to enter Jannah I would like to have certain benefits that I would not have had here in this dunya as I do not want to do anything against Islam and displease Allah (SWT). Shukran, your answer would be greatly appreciated.