Yes, they can be.

But it's generally been the case that those churches who let paedobaptists into membership soon have paedobaptist leaders.

Another issue is having the paedobaptists be baptized as believers by immersion. Someone's conscience is gong to be violated there- either the paedobaptist who is being immersed, or the Baptist church that would allow a paedobaptist into membership without immersing him or her.

True godliness is a sincere feeling which loves God as Father as much as it fears and reverences Him as Lord, embraces His righteousness, and dreads offending Him worse than death~ Calvin