The Christian life is a life-long process of death and resurrection. I believe you have seen the truth regarding the necessity of overcoming for participating in the resurrection (Rev 2:11). Unfortunately, most in Christianity think that salvation is when their spirit being is floating around in Heaven after they die, and neglect the physical aspects of salvation (ie the resurrection) and do not think God will require anything more of them (i.e. there is no further judgement).
But John 6:40 and John 6:54 do say that we have eternal life now, and will be raised up at the last day (unto eternal life). John 5:24 is also clear that we have eternal life now. You are talking about being raised up at the last day, and this is also to receive eternal life but it is not the same aspect of receiving eternal life as when we first believed in Christ.
The eternal life we receive now is sometimes called the salvation of the spirit/soul, and the eternal life we receive in future is the salvation of the body. We are now saved and will be saved in future. This is no doubt a process by which God will save our whole body, soul and spirit. So it is as correct to say" I was saved 10 years ago", as it is to say "I will be saved tomorrow, or in 10 years time", because salvation is something that doesn't stop when we first believe - not until our bodies are saved as well.
If we consider the whole of Scripture we will find that eternal life is something we have now and will receive in the future (but as conditional upon our overcoming - Rev 2:11). Phil 3:11 shows that Paul was trying to attain to the resurrection from the dead - it was not something he took for granted. With understanding that eternal life is not only a matter of time, but also of quality and substance, we can see that the Scripture does not contradict itself when it says we have eternal life now, and will receive it in the future.
Eternal life is not only a matter of time (quantity) but also a matter of quality. Eternal life is a life which is indestructible and which is the very indestructible life of God Himself. It is a life which is perfect and complete, lacking nothing. The eternal life that believers receive now, is nothing other than the Spirit of (eternal) life indwelling the believer. We have eternal life now in terms of quality, because we must die first, so eternal life in time does not begin until we are resurrected. As Romans 8:11 shows, having eternal life now in quality, is a condition for receiving eternal life in the future in quantity. The Spirit of (eternal) life who dwells in us now, is the same Spirit who will raise our bodies from the dead at the Lord's return.