Here's some more scripture to back up your assertion that "replacement theology is not biblical:"

"I do not want you to be ignorant of this mystery, brothers and sisters, so that you may not be conceited: Israel has experienced a hardening in part until the full number of the Gentiles has come in."

~ Romans 11:25

"And if they do not persist in unbelief, they will be grafted in, for God is able to graft them in again. After all, if you were cut out of an olive tree that is wild by nature, and contrary to nature were grafted into a cultivated olive tree, how much more readily will these, the natural branches, be grafted into their own olive tree!"

~ Romans 11:23-24

Isaiah cries out concerning Israel: 'Though the number of the Israelites be like the sand by the sea, only the remnant will be saved.'

~ Romans 9:27

So too, at the present time there is a remnant chosen by grace.

~ Romans 11:5

In the whole land," declares the Lord, "two-thirds will be struck down and perish; yet one-third will be left in it. This third I will put into the fire; I will refine them like silver and test them like gold. They will call on my name, and I will answer them; I will say, 'They are my people,' and they will say, 'The Lord is our God.'

~ Zechariah 13:8-9****