God spare life I will arrive at Orly Airport on February , Wednesday 07:45 AM.
This will be my first time to Paris.
I only have one backpack bag so I assume it will not taking a long time to go out from the airport.

I have a plan to visit Eiffel Tower and Notre Dame Church.
But I must catch my next flight at Charles De Gaulle Airport which will take off on 2:05 PM.
Will I have enough time?

I learn the map that I must use the RER-B from Orly to Antony and change the train at Notre Dame. Is that correct?
How long is from Notre Dame Church to Tour Eiffel by train or walk?

Finally what is the fast way to arrive at Charles De Gaulle from Eiffel (of course beside a taxi ride?)

Sorry for too many questions and bad English
Thank you very much in advance

From Orly take the Orlyval to station Antony where you pick up an RER B train going in the direction of CDG airport. Exit at Saint Michel Notre Dame station, walk up to the street and you are very close to Notre Dame cathedral. Have a stroll around then go back to the RER station and take an RER C train four stops to Champs de Mars Tour Eiffel, which will take about 15 minutes. From here it is just a few minutes walk to the tower. When finished at the tower go back to the RER station and take RER C back to station St Michel Notre Dame where you will transfer to an RER B train going to CDG airport. Allow 45-60 minutes to get from there to the airport, and remember that once you are at the airport you will need time to get from the train station to the terminal from which your flight departs.

Good luck with your fast dash through Paris; I will pray your flight arrives on time so you don't lose any time.

I have seen other posts that have mentioned ticket machine lines in the Paris airports that are longer if you are trying to use a credit card, so I would recommend that you have Euros upon arrival so you don't lose time in line waiting to get them or waiting for a ticket machine that takes credit cards.

Enjoy Paris!

Thank you so much for Seamus and Denisea helps.
I already print your explanations guys
How is the winter exactly in Paris?
I am Indonesian and so accustomed with sunny days

gray and gloomy and cold, for the most part. Check some weather channel to get an idea of the temperature.

I really would not do what you are planning, visiting both Eiffel Tower and Notre Dame, I don't see how you could possibly have enough time to do that. If this is an international flight leaving at 2 pm (meaning not just to a nearby European country), you should probably be at CDG around 11 am. The RER takes close to an hour from central Paris. If you get out of the airport by 8:15 you may be in central paris around 9, but that would be assuming you knew exactly what to do.